diff --git a/pip/basecommand.py b/pip/basecommand.py
index e88c7c57a..94d43e2e6 100644
--- a/pip/basecommand.py
+++ b/pip/basecommand.py
@@ -3,29 +3,29 @@ from __future__ import absolute_import
 
 import logging
 import logging.config
+import optparse
 import os
 import sys
-import optparse
 import warnings
 
 from pip import cmdoptions
+from pip.baseparser import ConfigOptionParser, UpdatingDefaultsHelpFormatter
+from pip.download import PipSession
+from pip.exceptions import (
+    BadCommand, CommandError, InstallationError, PreviousBuildDirError,
+    UninstallationError
+)
 from pip.index import PackageFinder
 from pip.locations import running_under_virtualenv
-from pip.download import PipSession
-from pip.exceptions import (BadCommand, InstallationError, UninstallationError,
-                            CommandError, PreviousBuildDirError)
-
-from pip.baseparser import ConfigOptionParser, UpdatingDefaultsHelpFormatter
 from pip.req import InstallRequirement, parse_requirements
 from pip.status_codes import (
-    SUCCESS, ERROR, UNKNOWN_ERROR, VIRTUALENV_NOT_FOUND,
-    PREVIOUS_BUILD_DIR_ERROR,
+    ERROR, PREVIOUS_BUILD_DIR_ERROR, SUCCESS, UNKNOWN_ERROR,
+    VIRTUALENV_NOT_FOUND
 )
 from pip.utils import deprecation, get_prog, normalize_path
 from pip.utils.logging import IndentingFormatter
 from pip.utils.outdated import pip_version_check
 
-
 __all__ = ['Command']
 
 
diff --git a/pip/baseparser.py b/pip/baseparser.py
index 6d304d1bc..2d0c260db 100644
--- a/pip/baseparser.py
+++ b/pip/baseparser.py
@@ -1,12 +1,13 @@
 """Base option parser setup"""
 from __future__ import absolute_import
 
-import sys
 import optparse
+import sys
 import textwrap
 from distutils.util import strtobool
 
 from pip._vendor.six import string_types
+
 from pip.configuration import Configuration
 from pip.utils import get_terminal_size
 
diff --git a/pip/cmdoptions.py b/pip/cmdoptions.py
index 494be4db4..3f9db5ba5 100644
--- a/pip/cmdoptions.py
+++ b/pip/cmdoptions.py
@@ -9,15 +9,15 @@ pass on state. To be consistent, all options will follow this design.
 """
 from __future__ import absolute_import
 
-from functools import partial
-from optparse import OptionGroup, SUPPRESS_HELP, Option
 import warnings
+from functools import partial
+from optparse import SUPPRESS_HELP, Option, OptionGroup
 
 from pip.index import (
-    FormatControl, fmt_ctl_handle_mutual_exclude, fmt_ctl_no_binary,
+    FormatControl, fmt_ctl_handle_mutual_exclude, fmt_ctl_no_binary
 )
-from pip.models import PyPI
 from pip.locations import USER_CACHE_DIR, src_prefix
+from pip.models import PyPI
 from pip.utils.hashes import STRONG_HASHES
 from pip.utils.ui import BAR_TYPES
 
diff --git a/pip/commands/check.py b/pip/commands/check.py
index fec858875..d951f8e87 100644
--- a/pip/commands/check.py
+++ b/pip/commands/check.py
@@ -4,7 +4,6 @@ from pip.basecommand import Command
 from pip.operations.check import check_requirements
 from pip.utils import get_installed_distributions
 
-
 logger = logging.getLogger(__name__)
 
 
diff --git a/pip/commands/completion.py b/pip/commands/completion.py
index 9d79d607e..ee1baf326 100644
--- a/pip/commands/completion.py
+++ b/pip/commands/completion.py
@@ -1,6 +1,7 @@
 from __future__ import absolute_import
 
 import sys
+
 from pip.basecommand import Command
 
 BASE_COMPLETION = """
diff --git a/pip/commands/download.py b/pip/commands/download.py
index 26b6e5f2e..97ec307d7 100644
--- a/pip/commands/download.py
+++ b/pip/commands/download.py
@@ -3,16 +3,15 @@ from __future__ import absolute_import
 import logging
 import os
 
+from pip import cmdoptions
+from pip.basecommand import RequirementCommand
 from pip.exceptions import CommandError
 from pip.index import FormatControl
 from pip.req import RequirementSet
-from pip.basecommand import RequirementCommand
-from pip import cmdoptions
 from pip.utils import ensure_dir, normalize_path
 from pip.utils.build import BuildDirectory
 from pip.utils.filesystem import check_path_owner
 
-
 logger = logging.getLogger(__name__)
 
 
diff --git a/pip/commands/freeze.py b/pip/commands/freeze.py
index 133ee397f..2f9abd883 100644
--- a/pip/commands/freeze.py
+++ b/pip/commands/freeze.py
@@ -3,12 +3,11 @@ from __future__ import absolute_import
 import sys
 
 import pip
-from pip.compat import stdlib_pkgs
 from pip.basecommand import Command
+from pip.compat import stdlib_pkgs
 from pip.operations.freeze import freeze
 from pip.wheel import WheelCache
 
-
 DEV_PKGS = {'pip', 'setuptools', 'distribute', 'wheel'}
 
 
diff --git a/pip/commands/hash.py b/pip/commands/hash.py
index 27cca0bfa..a2341a914 100644
--- a/pip/commands/hash.py
+++ b/pip/commands/hash.py
@@ -9,7 +9,6 @@ from pip.status_codes import ERROR
 from pip.utils import read_chunks
 from pip.utils.hashes import FAVORITE_HASH, STRONG_HASHES
 
-
 logger = logging.getLogger(__name__)
 
 
diff --git a/pip/commands/help.py b/pip/commands/help.py
index 11722f1e0..77664729f 100644
--- a/pip/commands/help.py
+++ b/pip/commands/help.py
@@ -1,6 +1,6 @@
 from __future__ import absolute_import
 
-from pip.basecommand import Command, SUCCESS
+from pip.basecommand import SUCCESS, Command
 from pip.exceptions import CommandError
 
 
diff --git a/pip/commands/install.py b/pip/commands/install.py
index a49dfa786..433400f0f 100644
--- a/pip/commands/install.py
+++ b/pip/commands/install.py
@@ -3,25 +3,26 @@ from __future__ import absolute_import
 import logging
 import operator
 import os
-import tempfile
 import shutil
+import tempfile
+
+from pip import cmdoptions
+from pip.basecommand import RequirementCommand
+from pip.exceptions import (
+    CommandError, InstallationError, PreviousBuildDirError
+)
+from pip.locations import distutils_scheme, virtualenv_no_global
+from pip.req import RequirementSet
+from pip.utils import ensure_dir, get_installed_version
+from pip.utils.build import BuildDirectory
+from pip.utils.filesystem import check_path_owner
+from pip.wheel import WheelBuilder, WheelCache
+
 try:
     import wheel
 except ImportError:
     wheel = None
 
-from pip.req import RequirementSet
-from pip.basecommand import RequirementCommand
-from pip.locations import virtualenv_no_global, distutils_scheme
-from pip.exceptions import (
-    InstallationError, CommandError, PreviousBuildDirError,
-)
-from pip import cmdoptions
-from pip.utils import ensure_dir, get_installed_version
-from pip.utils.build import BuildDirectory
-from pip.utils.filesystem import check_path_owner
-from pip.wheel import WheelCache, WheelBuilder
-
 
 logger = logging.getLogger(__name__)
 
diff --git a/pip/commands/list.py b/pip/commands/list.py
index 2758626e0..2891362f5 100644
--- a/pip/commands/list.py
+++ b/pip/commands/list.py
@@ -3,21 +3,22 @@ from __future__ import absolute_import
 import json
 import logging
 import warnings
+
+from pip._vendor import six
+
+from pip.basecommand import Command
+from pip.cmdoptions import index_group, make_option_group
+from pip.exceptions import CommandError
+from pip.index import PackageFinder
+from pip.utils import dist_is_editable, get_installed_distributions
+from pip.utils.deprecation import RemovedInPip11Warning
+from pip.utils.packaging import get_installer
+
 try:
     from itertools import zip_longest
 except ImportError:
     from itertools import izip_longest as zip_longest
 
-from pip._vendor import six
-
-from pip.basecommand import Command
-from pip.exceptions import CommandError
-from pip.index import PackageFinder
-from pip.utils import (
-    get_installed_distributions, dist_is_editable)
-from pip.utils.deprecation import RemovedInPip11Warning
-from pip.utils.packaging import get_installer
-from pip.cmdoptions import make_option_group, index_group
 
 logger = logging.getLogger(__name__)
 
diff --git a/pip/commands/search.py b/pip/commands/search.py
index e2f0ca5d0..6f23da407 100644
--- a/pip/commands/search.py
+++ b/pip/commands/search.py
@@ -3,20 +3,19 @@ from __future__ import absolute_import
 import logging
 import sys
 import textwrap
-
 from collections import OrderedDict
 
-from pip.basecommand import Command, SUCCESS
-from pip.download import PipXmlrpcTransport
-from pip.models import PyPI
-from pip.utils import get_terminal_size
-from pip.utils.logging import indent_log
-from pip.exceptions import CommandError
-from pip.status_codes import NO_MATCHES_FOUND
-from pip._vendor.packaging.version import parse as parse_version
 from pip._vendor import pkg_resources
+from pip._vendor.packaging.version import parse as parse_version
 from pip._vendor.six.moves import xmlrpc_client
 
+from pip.basecommand import SUCCESS, Command
+from pip.download import PipXmlrpcTransport
+from pip.exceptions import CommandError
+from pip.models import PyPI
+from pip.status_codes import NO_MATCHES_FOUND
+from pip.utils import get_terminal_size
+from pip.utils.logging import indent_log
 
 logger = logging.getLogger(__name__)
 
diff --git a/pip/commands/show.py b/pip/commands/show.py
index 111c16d1a..28e57c2c3 100644
--- a/pip/commands/show.py
+++ b/pip/commands/show.py
@@ -1,14 +1,14 @@
 from __future__ import absolute_import
 
-from email.parser import FeedParser
 import logging
 import os
+from email.parser import FeedParser
 
-from pip.basecommand import Command
-from pip.status_codes import SUCCESS, ERROR
 from pip._vendor import pkg_resources
 from pip._vendor.packaging.utils import canonicalize_name
 
+from pip.basecommand import Command
+from pip.status_codes import ERROR, SUCCESS
 
 logger = logging.getLogger(__name__)
 
diff --git a/pip/commands/uninstall.py b/pip/commands/uninstall.py
index 130bec958..e12bfa477 100644
--- a/pip/commands/uninstall.py
+++ b/pip/commands/uninstall.py
@@ -2,9 +2,9 @@ from __future__ import absolute_import
 
 from pip._vendor.packaging.utils import canonicalize_name
 
-from pip.req import InstallRequirement, parse_requirements
 from pip.basecommand import Command
 from pip.exceptions import InstallationError
+from pip.req import InstallRequirement, parse_requirements
 
 
 class UninstallCommand(Command):
diff --git a/pip/commands/wheel.py b/pip/commands/wheel.py
index a15bcd899..d2fea830e 100644
--- a/pip/commands/wheel.py
+++ b/pip/commands/wheel.py
@@ -4,14 +4,13 @@ from __future__ import absolute_import
 import logging
 import os
 
+from pip import cmdoptions
 from pip.basecommand import RequirementCommand
 from pip.exceptions import CommandError, PreviousBuildDirError
 from pip.req import RequirementSet
 from pip.utils import import_or_raise
 from pip.utils.build import BuildDirectory
-from pip.wheel import WheelCache, WheelBuilder
-from pip import cmdoptions
-
+from pip.wheel import WheelBuilder, WheelCache
 
 logger = logging.getLogger(__name__)
 
diff --git a/pip/configuration.py b/pip/configuration.py
index f01e09874..01b68abf1 100644
--- a/pip/configuration.py
+++ b/pip/configuration.py
@@ -1,18 +1,18 @@
 """Configuration management setup
 """
 
-import re
 import os
+import re
 import sys
 
 from pip._vendor.six.moves import configparser
+
 from pip.locations import (
-    legacy_config_file, config_basename, running_under_virtualenv,
+    config_basename, legacy_config_file, running_under_virtualenv,
     site_config_files
 )
 from pip.utils import appdirs
 
-
 _environ_prefix_re = re.compile(r"^PIP_", re.I)
 
 
diff --git a/pip/download.py b/pip/download.py
index 894d0ff9a..06e07ecb0 100644
--- a/pip/download.py
+++ b/pip/download.py
@@ -13,44 +13,43 @@ import shutil
 import sys
 import tempfile
 
-try:
-    import ssl  # noqa
-    HAS_TLS = True
-except ImportError:
-    HAS_TLS = False
-
+from pip._vendor import requests, six
+from pip._vendor.cachecontrol import CacheControlAdapter
+from pip._vendor.cachecontrol.caches import FileCache
+from pip._vendor.lockfile import LockError
+from pip._vendor.requests.adapters import BaseAdapter, HTTPAdapter
+from pip._vendor.requests.auth import AuthBase, HTTPBasicAuth
+from pip._vendor.requests.models import CONTENT_CHUNK_SIZE, Response
+from pip._vendor.requests.packages import urllib3
+from pip._vendor.requests.structures import CaseInsensitiveDict
+from pip._vendor.requests.utils import get_netrc_auth
+from pip._vendor.six.moves import xmlrpc_client
 from pip._vendor.six.moves.urllib import parse as urllib_parse
 from pip._vendor.six.moves.urllib import request as urllib_request
 from pip._vendor.six.moves.urllib.parse import unquote as urllib_unquote
 
 import pip
-
-from pip.exceptions import InstallationError, HashMismatch
+from pip.exceptions import HashMismatch, InstallationError
+from pip.locations import write_delete_marker_file
 from pip.models import PyPI
-from pip.utils import (splitext, rmtree, format_size, display_path,
-                       backup_dir, ask_path_exists, unpack_file,
-                       ARCHIVE_EXTENSIONS, consume, call_subprocess,
-                       get_installed_version)
+from pip.utils import (
+    ARCHIVE_EXTENSIONS, ask_path_exists, backup_dir, call_subprocess, consume,
+    display_path, format_size, get_installed_version, rmtree, splitext,
+    unpack_file
+)
 from pip.utils.encoding import auto_decode
 from pip.utils.filesystem import check_path_owner
+from pip.utils.glibc import libc_ver
 from pip.utils.logging import indent_log
 from pip.utils.setuptools_build import SETUPTOOLS_SHIM
-from pip.utils.glibc import libc_ver
 from pip.utils.ui import DownloadProgressProvider
-from pip.locations import write_delete_marker_file
 from pip.vcs import vcs
-from pip._vendor import requests, six
-from pip._vendor.requests.adapters import BaseAdapter, HTTPAdapter
-from pip._vendor.requests.auth import AuthBase, HTTPBasicAuth
-from pip._vendor.requests.models import CONTENT_CHUNK_SIZE, Response
-from pip._vendor.requests.utils import get_netrc_auth
-from pip._vendor.requests.structures import CaseInsensitiveDict
-from pip._vendor.requests.packages import urllib3
-from pip._vendor.cachecontrol import CacheControlAdapter
-from pip._vendor.cachecontrol.caches import FileCache
-from pip._vendor.lockfile import LockError
-from pip._vendor.six.moves import xmlrpc_client
 
+try:
+    import ssl  # noqa
+    HAS_TLS = True
+except ImportError:
+    HAS_TLS = False
 
 __all__ = ['get_file_content',
            'is_url', 'url_to_path', 'path_to_url',
diff --git a/pip/index.py b/pip/index.py
index 83f6a39a6..65d98992a 100644
--- a/pip/index.py
+++ b/pip/index.py
@@ -1,42 +1,41 @@
 """Routines related to PyPI, indexes"""
 from __future__ import absolute_import
 
-import logging
 import cgi
-from collections import namedtuple
 import itertools
-import sys
-import os
-import re
+import logging
 import mimetypes
+import os
 import posixpath
+import re
+import sys
 import warnings
+from collections import namedtuple
 
+from pip._vendor import html5lib, requests, six
+from pip._vendor.distlib.compat import unescape
+from pip._vendor.packaging import specifiers
+from pip._vendor.packaging.utils import canonicalize_name
+from pip._vendor.packaging.version import parse as parse_version
+from pip._vendor.requests.exceptions import SSLError
 from pip._vendor.six.moves.urllib import parse as urllib_parse
 from pip._vendor.six.moves.urllib import request as urllib_request
 
 from pip.compat import ipaddress
+from pip.download import HAS_TLS, is_url, path_to_url, url_to_path
+from pip.exceptions import (
+    BestVersionAlreadyInstalled, DistributionNotFound, InvalidWheelFilename,
+    UnsupportedWheel
+)
+from pip.pep425tags import get_supported
 from pip.utils import (
-    cached_property, splitext, normalize_path,
-    ARCHIVE_EXTENSIONS, SUPPORTED_EXTENSIONS,
+    ARCHIVE_EXTENSIONS, SUPPORTED_EXTENSIONS, cached_property, normalize_path,
+    splitext
 )
 from pip.utils.deprecation import RemovedInPip11Warning
 from pip.utils.logging import indent_log
 from pip.utils.packaging import check_requires_python
-from pip.exceptions import (
-    DistributionNotFound, BestVersionAlreadyInstalled, InvalidWheelFilename,
-    UnsupportedWheel,
-)
-from pip.download import HAS_TLS, is_url, path_to_url, url_to_path
 from pip.wheel import Wheel, wheel_ext
-from pip.pep425tags import get_supported
-from pip._vendor import html5lib, requests, six
-from pip._vendor.packaging.version import parse as parse_version
-from pip._vendor.packaging.utils import canonicalize_name
-from pip._vendor.packaging import specifiers
-from pip._vendor.requests.exceptions import SSLError
-from pip._vendor.distlib.compat import unescape
-
 
 __all__ = ['FormatControl', 'fmt_ctl_handle_mutual_exclude', 'PackageFinder']
 
diff --git a/pip/locations.py b/pip/locations.py
index a3478aee6..1b5738344 100644
--- a/pip/locations.py
+++ b/pip/locations.py
@@ -7,14 +7,12 @@ import platform
 import site
 import sys
 import sysconfig
-
 from distutils import sysconfig as distutils_sysconfig
-from distutils.command.install import install, SCHEME_KEYS  # noqa
+from distutils.command.install import SCHEME_KEYS, install  # noqa
 
 from pip.compat import WINDOWS, expanduser
 from pip.utils import appdirs
 
-
 # Application Directories
 USER_CACHE_DIR = appdirs.user_cache_dir("pip")
 
diff --git a/pip/operations/freeze.py b/pip/operations/freeze.py
index 9ed3564de..6772022fd 100644
--- a/pip/operations/freeze.py
+++ b/pip/operations/freeze.py
@@ -5,15 +5,15 @@ import os
 import re
 import warnings
 
-from pip.exceptions import InstallationError
-from pip.req import InstallRequirement
-from pip.req.req_file import COMMENT_RE
-from pip.utils import get_installed_distributions, dist_is_editable
-from pip.utils.deprecation import RemovedInPip11Warning
 from pip._vendor import pkg_resources
 from pip._vendor.packaging.utils import canonicalize_name
 from pip._vendor.pkg_resources import RequirementParseError
 
+from pip.exceptions import InstallationError
+from pip.req import InstallRequirement
+from pip.req.req_file import COMMENT_RE
+from pip.utils import dist_is_editable, get_installed_distributions
+from pip.utils.deprecation import RemovedInPip11Warning
 
 logger = logging.getLogger(__name__)
 
diff --git a/pip/pep425tags.py b/pip/pep425tags.py
index 1278e0f63..e33b6ce0e 100644
--- a/pip/pep425tags.py
+++ b/pip/pep425tags.py
@@ -2,13 +2,12 @@
 from __future__ import absolute_import
 
 import distutils.util
+import logging
+import platform
 import re
 import sys
 import sysconfig
 import warnings
-import platform
-import logging
-
 from collections import OrderedDict
 
 import pip.utils.glibc
diff --git a/pip/req/req_file.py b/pip/req/req_file.py
index caa3527ca..8231c456f 100644
--- a/pip/req/req_file.py
+++ b/pip/req/req_file.py
@@ -4,19 +4,19 @@ Requirements file parsing
 
 from __future__ import absolute_import
 
+import optparse
 import os
 import re
 import shlex
 import sys
-import optparse
 
-from pip._vendor.six.moves.urllib import parse as urllib_parse
 from pip._vendor.six.moves import filterfalse
+from pip._vendor.six.moves.urllib import parse as urllib_parse
 
-from pip.download import get_file_content
-from pip.req.req_install import InstallRequirement
-from pip.exceptions import (RequirementsFileParseError)
 from pip import cmdoptions
+from pip.download import get_file_content
+from pip.exceptions import RequirementsFileParseError
+from pip.req.req_install import InstallRequirement
 
 __all__ = ['parse_requirements']
 
diff --git a/pip/req/req_install.py b/pip/req/req_install.py
index 6c7fe4f75..86f4c550e 100644
--- a/pip/req/req_install.py
+++ b/pip/req/req_install.py
@@ -10,7 +10,6 @@ import tempfile
 import traceback
 import warnings
 import zipfile
-
 from distutils.util import change_root
 from email.parser import FeedParser
 
@@ -19,36 +18,28 @@ from pip._vendor.packaging import specifiers
 from pip._vendor.packaging.markers import Marker
 from pip._vendor.packaging.requirements import InvalidRequirement, Requirement
 from pip._vendor.packaging.utils import canonicalize_name
-from pip._vendor.packaging.version import Version, parse as parse_version
-from pip._vendor.pkg_resources import parse_requirements, RequirementParseError
-
+from pip._vendor.packaging.version import parse as parse_version
+from pip._vendor.packaging.version import Version
+from pip._vendor.pkg_resources import RequirementParseError, parse_requirements
 
 import pip.wheel
-
 from pip.compat import native_str
-from pip.download import is_url, url_to_path, path_to_url, is_archive_file
-from pip.exceptions import (
-    InstallationError, UninstallationError,
-)
-from pip.locations import (
-    running_under_virtualenv, PIP_DELETE_MARKER_FILENAME,
-)
+from pip.download import is_archive_file, is_url, path_to_url, url_to_path
+from pip.exceptions import InstallationError, UninstallationError
+from pip.locations import PIP_DELETE_MARKER_FILENAME, running_under_virtualenv
+from pip.req.req_uninstall import UninstallPathSet
 from pip.utils import (
-    display_path, rmtree, ask_path_exists, backup_dir, is_installable_dir,
-    dist_in_usersite, dist_in_site_packages,
-    call_subprocess, read_text_file, _make_build_dir, ensure_dir,
-    get_installed_version,
+    _make_build_dir, ask_path_exists, backup_dir, call_subprocess,
+    display_path, dist_in_site_packages, dist_in_usersite, ensure_dir,
+    get_installed_version, is_installable_dir, read_text_file, rmtree
 )
-
-from pip.utils.hashes import Hashes
 from pip.utils.deprecation import RemovedInPip11Warning
+from pip.utils.hashes import Hashes
 from pip.utils.logging import indent_log
 from pip.utils.setuptools_build import SETUPTOOLS_SHIM
 from pip.utils.ui import open_spinner
-from pip.req.req_uninstall import UninstallPathSet
 from pip.vcs import vcs
-from pip.wheel import move_wheel_files, Wheel
-
+from pip.wheel import Wheel, move_wheel_files
 
 logger = logging.getLogger(__name__)
 
diff --git a/pip/req/req_set.py b/pip/req/req_set.py
index 119a83dca..dfb372d66 100644
--- a/pip/req/req_set.py
+++ b/pip/req/req_set.py
@@ -1,24 +1,26 @@
 from __future__ import absolute_import
 
-from collections import defaultdict
-from itertools import chain
 import logging
 import os
+from collections import defaultdict
+from itertools import chain
 
-from pip._vendor import pkg_resources
-from pip._vendor import requests
+from pip._vendor import pkg_resources, requests
 
 from pip.compat import expanduser
-from pip.download import (is_file_url, is_dir_url, is_vcs_url, url_to_path,
-                          unpack_url)
-from pip.exceptions import (InstallationError, BestVersionAlreadyInstalled,
-                            DistributionNotFound, PreviousBuildDirError,
-                            HashError, HashErrors, HashUnpinned,
-                            DirectoryUrlHashUnsupported, VcsHashUnsupported,
-                            UnsupportedPythonVersion)
+from pip.download import (
+    is_dir_url, is_file_url, is_vcs_url, unpack_url, url_to_path
+)
+from pip.exceptions import (
+    BestVersionAlreadyInstalled, DirectoryUrlHashUnsupported,
+    DistributionNotFound, HashError, HashErrors, HashUnpinned,
+    InstallationError, PreviousBuildDirError, UnsupportedPythonVersion,
+    VcsHashUnsupported
+)
 from pip.req.req_install import InstallRequirement
 from pip.utils import (
-    display_path, dist_in_usersite, ensure_dir, normalize_path)
+    display_path, dist_in_usersite, ensure_dir, normalize_path
+)
 from pip.utils.hashes import MissingHashes
 from pip.utils.logging import indent_log
 from pip.utils.packaging import check_dist_requires_python
diff --git a/pip/req/req_uninstall.py b/pip/req/req_uninstall.py
index 39809fe0b..49fbc4540 100644
--- a/pip/req/req_uninstall.py
+++ b/pip/req/req_uninstall.py
@@ -10,19 +10,15 @@ import tempfile
 
 from pip._vendor import pkg_resources
 
-from pip.compat import uses_pycache, WINDOWS, cache_from_source
+from pip.compat import WINDOWS, cache_from_source, uses_pycache
 from pip.exceptions import UninstallationError
-from pip.locations import (
-    bin_py, bin_user,
-)
+from pip.locations import bin_py, bin_user
 from pip.utils import (
-    rmtree, ask, dist_in_usersite, is_local,
-    egg_link_path, FakeFile,
-    renames, normalize_path, dist_is_local,
+    FakeFile, ask, dist_in_usersite, dist_is_local, egg_link_path, is_local,
+    normalize_path, renames, rmtree
 )
 from pip.utils.logging import indent_log
 
-
 logger = logging.getLogger(__name__)
 
 
diff --git a/pip/utils/appdirs.py b/pip/utils/appdirs.py
index d41102cef..62f511eb9 100644
--- a/pip/utils/appdirs.py
+++ b/pip/utils/appdirs.py
@@ -7,9 +7,10 @@ from __future__ import absolute_import
 import os
 import sys
 
-from pip.compat import WINDOWS, expanduser
 from pip._vendor.six import PY2, text_type
 
+from pip.compat import WINDOWS, expanduser
+
 
 def user_cache_dir(appname):
     r"""
diff --git a/pip/utils/encoding.py b/pip/utils/encoding.py
index f1f3a4a67..f308878bf 100644
--- a/pip/utils/encoding.py
+++ b/pip/utils/encoding.py
@@ -2,7 +2,6 @@ import codecs
 import locale
 import re
 
-
 BOMS = [
     (codecs.BOM_UTF8, 'utf8'),
     (codecs.BOM_UTF16, 'utf16'),
diff --git a/pip/utils/glibc.py b/pip/utils/glibc.py
index 7847885c4..d98e4fc99 100644
--- a/pip/utils/glibc.py
+++ b/pip/utils/glibc.py
@@ -1,8 +1,8 @@
 from __future__ import absolute_import
 
-import re
 import ctypes
 import platform
+import re
 import warnings
 
 
diff --git a/pip/utils/hashes.py b/pip/utils/hashes.py
index 960297007..9a3e37b36 100644
--- a/pip/utils/hashes.py
+++ b/pip/utils/hashes.py
@@ -2,10 +2,10 @@ from __future__ import absolute_import
 
 import hashlib
 
-from pip.exceptions import HashMismatch, HashMissing, InstallationError
-from pip.utils import read_chunks
 from pip._vendor.six import iteritems, iterkeys, itervalues
 
+from pip.exceptions import HashMismatch, HashMissing, InstallationError
+from pip.utils import read_chunks
 
 # The recommended hash algo of the moment. Change this whenever the state of
 # the art changes; it won't hurt backward compatibility.
diff --git a/pip/utils/logging.py b/pip/utils/logging.py
index 1c1053abf..b2bc022ba 100644
--- a/pip/utils/logging.py
+++ b/pip/utils/logging.py
@@ -5,13 +5,14 @@ import logging
 import logging.handlers
 import os
 
+from pip.compat import WINDOWS
+from pip.utils import ensure_dir
+
 try:
     import threading
 except ImportError:
     import dummy_threading as threading
 
-from pip.compat import WINDOWS
-from pip.utils import ensure_dir
 
 try:
     from pip._vendor import colorama
diff --git a/pip/utils/outdated.py b/pip/utils/outdated.py
index bf6ff3fa7..517d3bc9a 100644
--- a/pip/utils/outdated.py
+++ b/pip/utils/outdated.py
@@ -15,7 +15,6 @@ from pip.locations import USER_CACHE_DIR, running_under_virtualenv
 from pip.utils import ensure_dir, get_installed_version
 from pip.utils.filesystem import check_path_owner
 
-
 SELFCHECK_DATE_FMT = "%Y-%m-%dT%H:%M:%SZ"
 
 
diff --git a/pip/utils/packaging.py b/pip/utils/packaging.py
index 5464dd133..e789d45e6 100644
--- a/pip/utils/packaging.py
+++ b/pip/utils/packaging.py
@@ -1,13 +1,11 @@
 from __future__ import absolute_import
 
-from email.parser import FeedParser
-
 import logging
 import sys
+from email.parser import FeedParser
 
-from pip._vendor.packaging import specifiers
-from pip._vendor.packaging import version
 from pip._vendor import pkg_resources
+from pip._vendor.packaging import specifiers, version
 
 from pip import exceptions
 
diff --git a/pip/utils/ui.py b/pip/utils/ui.py
index 3dae81109..10f57f0e2 100644
--- a/pip/utils/ui.py
+++ b/pip/utils/ui.py
@@ -1,25 +1,23 @@
-from __future__ import absolute_import
-from __future__ import division
+from __future__ import absolute_import, division
 
-import itertools
-import sys
-from signal import signal, SIGINT, default_int_handler
-import time
 import contextlib
+import itertools
 import logging
+import sys
+import time
+from signal import SIGINT, default_int_handler, signal
+
+from pip._vendor import six
+from pip._vendor.progress.bar import (
+    Bar, ChargingBar, FillingCirclesBar, FillingSquaresBar, IncrementalBar,
+    ShadyBar
+)
+from pip._vendor.progress.helpers import HIDE_CURSOR, SHOW_CURSOR, WritelnMixin
+from pip._vendor.progress.spinner import Spinner
 
 from pip.compat import WINDOWS
 from pip.utils import format_size
 from pip.utils.logging import get_indentation
-from pip._vendor import six
-
-from pip._vendor.progress.bar import Bar, IncrementalBar
-from pip._vendor.progress.bar import FillingCirclesBar, FillingSquaresBar
-from pip._vendor.progress.bar import ChargingBar, ShadyBar
-
-from pip._vendor.progress.helpers import (WritelnMixin,
-                                          HIDE_CURSOR, SHOW_CURSOR)
-from pip._vendor.progress.spinner import Spinner
 
 try:
     from pip._vendor import colorama
diff --git a/pip/vcs/bazaar.py b/pip/vcs/bazaar.py
index 0f095841d..eda3c2599 100644
--- a/pip/vcs/bazaar.py
+++ b/pip/vcs/bazaar.py
@@ -4,16 +4,16 @@ import logging
 import os
 import tempfile
 
+from pip.download import path_to_url
+from pip.utils import display_path, rmtree
+from pip.vcs import VersionControl, vcs
+
 # TODO: Get this into six.moves.urllib.parse
 try:
     from urllib import parse as urllib_parse
 except ImportError:
     import urlparse as urllib_parse
 
-from pip.utils import rmtree, display_path
-from pip.vcs import vcs, VersionControl
-from pip.download import path_to_url
-
 
 logger = logging.getLogger(__name__)
 
diff --git a/pip/vcs/git.py b/pip/vcs/git.py
index e2f6c6e07..aba48014c 100644
--- a/pip/vcs/git.py
+++ b/pip/vcs/git.py
@@ -1,18 +1,17 @@
 from __future__ import absolute_import
 
 import logging
-import tempfile
 import os.path
+import tempfile
+
+from pip._vendor.packaging.version import parse as parse_version
+from pip._vendor.six.moves.urllib import parse as urllib_parse
+from pip._vendor.six.moves.urllib import request as urllib_request
 
 from pip.compat import samefile
 from pip.exceptions import BadCommand
-from pip._vendor.six.moves.urllib import parse as urllib_parse
-from pip._vendor.six.moves.urllib import request as urllib_request
-from pip._vendor.packaging.version import parse as parse_version
-
 from pip.utils import display_path, rmtree
-from pip.vcs import vcs, VersionControl
-
+from pip.vcs import VersionControl, vcs
 
 urlsplit = urllib_parse.urlsplit
 urlunsplit = urllib_parse.urlunsplit
diff --git a/pip/vcs/mercurial.py b/pip/vcs/mercurial.py
index 1aa83b914..6f3c9af5c 100644
--- a/pip/vcs/mercurial.py
+++ b/pip/vcs/mercurial.py
@@ -4,11 +4,11 @@ import logging
 import os
 import tempfile
 
-from pip.utils import display_path, rmtree
-from pip.vcs import vcs, VersionControl
-from pip.download import path_to_url
 from pip._vendor.six.moves import configparser
 
+from pip.download import path_to_url
+from pip.utils import display_path, rmtree
+from pip.vcs import VersionControl, vcs
 
 logger = logging.getLogger(__name__)
 
diff --git a/pip/vcs/subversion.py b/pip/vcs/subversion.py
index d0de50580..77b66c91e 100644
--- a/pip/vcs/subversion.py
+++ b/pip/vcs/subversion.py
@@ -7,9 +7,9 @@ import re
 from pip._vendor.six.moves.urllib import parse as urllib_parse
 
 from pip.index import Link
-from pip.utils import rmtree, display_path
+from pip.utils import display_path, rmtree
 from pip.utils.logging import indent_log
-from pip.vcs import vcs, VersionControl
+from pip.vcs import VersionControl, vcs
 
 _svn_xml_url_re = re.compile('url="([^"]+)"')
 _svn_rev_re = re.compile(r'committed-rev="(\d+)"')
diff --git a/pip/wheel.py b/pip/wheel.py
index 1a3660478..8abe958de 100644
--- a/pip/wheel.py
+++ b/pip/wheel.py
@@ -16,29 +16,28 @@ import stat
 import sys
 import tempfile
 import warnings
-
 from base64 import urlsafe_b64encode
 from email.parser import Parser
 
+from pip._vendor import pkg_resources
+from pip._vendor.distlib.scripts import ScriptMaker
+from pip._vendor.packaging.utils import canonicalize_name
 from pip._vendor.six import StringIO
 
 import pip
+from pip import pep425tags
 from pip.compat import expanduser
 from pip.download import path_to_url, unpack_url
 from pip.exceptions import (
-    InstallationError, InvalidWheelFilename, UnsupportedWheel)
-from pip.locations import distutils_scheme, PIP_DELETE_MARKER_FILENAME
-from pip import pep425tags
-from pip.utils import (
-    call_subprocess, ensure_dir, captured_stdout, rmtree, read_chunks,
+    InstallationError, InvalidWheelFilename, UnsupportedWheel
+)
+from pip.locations import PIP_DELETE_MARKER_FILENAME, distutils_scheme
+from pip.utils import (
+    call_subprocess, captured_stdout, ensure_dir, read_chunks, rmtree
 )
-from pip.utils.ui import open_spinner
 from pip.utils.logging import indent_log
 from pip.utils.setuptools_build import SETUPTOOLS_SHIM
-from pip._vendor.distlib.scripts import ScriptMaker
-from pip._vendor import pkg_resources
-from pip._vendor.packaging.utils import canonicalize_name
-
+from pip.utils.ui import open_spinner
 
 wheel_ext = '.whl'
 
diff --git a/tests/conftest.py b/tests/conftest.py
index 2d643df20..94a9677ff 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -3,13 +3,11 @@ import os
 import shutil
 import sys
 
-import pytest
-
 import six
 
 import pip
+import pytest
 from pip.utils import appdirs
-
 from tests.lib import SRC_DIR, TestData
 from tests.lib.path import Path
 from tests.lib.scripttest import PipTestEnvironment
diff --git a/tests/data/packages/BrokenEmitsUTF8/setup.py b/tests/data/packages/BrokenEmitsUTF8/setup.py
index 067d580fb..81c5baead 100644
--- a/tests/data/packages/BrokenEmitsUTF8/setup.py
+++ b/tests/data/packages/BrokenEmitsUTF8/setup.py
@@ -1,7 +1,8 @@
 # -*- coding: utf-8 -*-
 
-from distutils.core import setup
 import sys
+from distutils.core import setup
+
 
 class FakeError(Exception):
     pass
diff --git a/tests/data/packages/FSPkg/setup.py b/tests/data/packages/FSPkg/setup.py
index 1215408c8..44c8ea386 100644
--- a/tests/data/packages/FSPkg/setup.py
+++ b/tests/data/packages/FSPkg/setup.py
@@ -1,4 +1,4 @@
-from setuptools import setup, find_packages
+from setuptools import find_packages, setup
 
 version = '0.1dev'
 
diff --git a/tests/data/packages/HackedEggInfo/setup.py b/tests/data/packages/HackedEggInfo/setup.py
index 4115d96be..171f5a2a3 100644
--- a/tests/data/packages/HackedEggInfo/setup.py
+++ b/tests/data/packages/HackedEggInfo/setup.py
@@ -3,6 +3,7 @@
 from setuptools import setup
 from setuptools.command import egg_info as orig_egg_info
 
+
 class egg_info (orig_egg_info.egg_info):
     def run(self):
         orig_egg_info.egg_info.run(self)
diff --git a/tests/data/packages/LineEndings/setup.py b/tests/data/packages/LineEndings/setup.py
index d65ccfb76..5bb4a1123 100644
--- a/tests/data/packages/LineEndings/setup.py
+++ b/tests/data/packages/LineEndings/setup.py
@@ -1,3 +1,3 @@
-from distutils.core import setup
-
-setup()
+from distutils.core import setup
+
+setup()
diff --git a/tests/data/packages/LocalEnvironMarker/setup.py b/tests/data/packages/LocalEnvironMarker/setup.py
index 33338a8e2..00f18d583 100644
--- a/tests/data/packages/LocalEnvironMarker/setup.py
+++ b/tests/data/packages/LocalEnvironMarker/setup.py
@@ -1,5 +1,6 @@
 import os
-from setuptools import setup, find_packages
+
+from setuptools import find_packages, setup
 
 
 def path_to_url(path):
diff --git a/tests/data/packages/LocalExtras-0.0.2/setup.py b/tests/data/packages/LocalExtras-0.0.2/setup.py
index 4167e1410..acc55f967 100644
--- a/tests/data/packages/LocalExtras-0.0.2/setup.py
+++ b/tests/data/packages/LocalExtras-0.0.2/setup.py
@@ -1,5 +1,6 @@
 import os
-from setuptools import setup, find_packages
+
+from setuptools import find_packages, setup
 
 
 def path_to_url(path):
diff --git a/tests/data/packages/LocalExtras/setup.py b/tests/data/packages/LocalExtras/setup.py
index 33a2f26c8..f25cc16c6 100644
--- a/tests/data/packages/LocalExtras/setup.py
+++ b/tests/data/packages/LocalExtras/setup.py
@@ -1,5 +1,6 @@
 import os
-from setuptools import setup, find_packages
+
+from setuptools import find_packages, setup
 
 
 def path_to_url(path):
diff --git a/tests/data/packages/requires_wheelbroken_upper/setup.py b/tests/data/packages/requires_wheelbroken_upper/setup.py
index 255cf2219..150f98dfb 100644
--- a/tests/data/packages/requires_wheelbroken_upper/setup.py
+++ b/tests/data/packages/requires_wheelbroken_upper/setup.py
@@ -1,4 +1,5 @@
 import setuptools
+
 setuptools.setup(
     name="requires_wheelbroken_upper",
     version="0",
diff --git a/tests/data/src/chattymodule/setup.py b/tests/data/src/chattymodule/setup.py
index abc56b161..7211972d1 100644
--- a/tests/data/src/chattymodule/setup.py
+++ b/tests/data/src/chattymodule/setup.py
@@ -1,9 +1,10 @@
 # A chatty setup.py for testing pip subprocess output handling
 
-from setuptools import setup
 import os
 import sys
 
+from setuptools import setup
+
 print("HELLO FROM CHATTYMODULE %s" % (sys.argv[1],))
 print(os.environ)
 print(sys.argv)
diff --git a/tests/data/src/compilewheel/setup.py b/tests/data/src/compilewheel/setup.py
index 46305d226..8319a2a5c 100644
--- a/tests/data/src/compilewheel/setup.py
+++ b/tests/data/src/compilewheel/setup.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-from setuptools import setup, find_packages
+from setuptools import find_packages, setup
 
 setup(name='compilewheel',
       version='1.0',
diff --git a/tests/data/src/prjwithdatafile/setup.py b/tests/data/src/prjwithdatafile/setup.py
index b040adfeb..94863b57b 100755
--- a/tests/data/src/prjwithdatafile/setup.py
+++ b/tests/data/src/prjwithdatafile/setup.py
@@ -1,12 +1,12 @@
-# -*- coding: utf-8 -*-
-from setuptools import setup
-
-setup(
-    name='prjwithdatafile',
-    version="1.0",
-    packages=['prjwithdatafile'],
-    data_files=[
-        (r'packages1', ['prjwithdatafile/README.txt']),
-        (r'packages2', ['prjwithdatafile/README.txt'])
-    ]
-)
+# -*- coding: utf-8 -*-
+from setuptools import setup
+
+setup(
+    name='prjwithdatafile',
+    version="1.0",
+    packages=['prjwithdatafile'],
+    data_files=[
+        (r'packages1', ['prjwithdatafile/README.txt']),
+        (r'packages2', ['prjwithdatafile/README.txt'])
+    ]
+)
diff --git a/tests/data/src/requires_simple/setup.py b/tests/data/src/requires_simple/setup.py
index 3f7983b82..57122041a 100644
--- a/tests/data/src/requires_simple/setup.py
+++ b/tests/data/src/requires_simple/setup.py
@@ -1,4 +1,4 @@
-from setuptools import setup, find_packages
+from setuptools import find_packages, setup
 
 setup(name='requires_simple',
       version='0.1',
diff --git a/tests/data/src/sample/setup.py b/tests/data/src/sample/setup.py
index 8dc8a0660..73172bedc 100644
--- a/tests/data/src/sample/setup.py
+++ b/tests/data/src/sample/setup.py
@@ -1,8 +1,9 @@
-from setuptools import setup, find_packages
 import codecs
 import os
 import re
 
+from setuptools import find_packages, setup
+
 here = os.path.abspath(os.path.dirname(__file__))
 
 # Read the version number from a source file.
diff --git a/tests/data/src/simplewheel-1.0/setup.py b/tests/data/src/simplewheel-1.0/setup.py
index 97a2210f0..f54a4502c 100644
--- a/tests/data/src/simplewheel-1.0/setup.py
+++ b/tests/data/src/simplewheel-1.0/setup.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-from setuptools import setup, find_packages
+from setuptools import find_packages, setup
 
 setup(name='simplewheel',
       version='1.0',
diff --git a/tests/data/src/simplewheel-2.0/setup.py b/tests/data/src/simplewheel-2.0/setup.py
index f2b31f6af..e889bb644 100644
--- a/tests/data/src/simplewheel-2.0/setup.py
+++ b/tests/data/src/simplewheel-2.0/setup.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-from setuptools import setup, find_packages
+from setuptools import find_packages, setup
 
 setup(name='simplewheel',
       version='2.0',
diff --git a/tests/data/src/singlemodule/setup.py b/tests/data/src/singlemodule/setup.py
index 67ca9faef..622af1f8e 100644
--- a/tests/data/src/singlemodule/setup.py
+++ b/tests/data/src/singlemodule/setup.py
@@ -1,6 +1,5 @@
 from setuptools import setup
 
-
 setup(
     name="singlemodule",
     version='0.0.1',
diff --git a/tests/functional/test_download.py b/tests/functional/test_download.py
index cb3de1e77..305ce8a73 100644
--- a/tests/functional/test_download.py
+++ b/tests/functional/test_download.py
@@ -1,7 +1,7 @@
 import os
 import textwrap
-import pytest
 
+import pytest
 from pip.status_codes import ERROR
 from tests.lib.path import Path
 
diff --git a/tests/functional/test_freeze.py b/tests/functional/test_freeze.py
index 1852fd98e..995ee3471 100644
--- a/tests/functional/test_freeze.py
+++ b/tests/functional/test_freeze.py
@@ -1,13 +1,12 @@
-import sys
 import os
 import re
+import sys
 import textwrap
+from doctest import ELLIPSIS, OutputChecker
+
 import pytest
-from doctest import OutputChecker, ELLIPSIS
-
 from tests.lib import _create_test_package, _create_test_package_with_srcdir
 
-
 distribute_re = re.compile('^distribute==[0-9.]+\n', re.MULTILINE)
 
 
diff --git a/tests/functional/test_help.py b/tests/functional/test_help.py
index 994cb66ab..862319c11 100644
--- a/tests/functional/test_help.py
+++ b/tests/functional/test_help.py
@@ -1,10 +1,9 @@
 import pytest
-
-from pip.exceptions import CommandError
-from pip.basecommand import ERROR, SUCCESS
-from pip.commands.help import HelpCommand
-from pip.commands import commands_dict as commands
 from mock import Mock
+from pip.basecommand import ERROR, SUCCESS
+from pip.commands import commands_dict as commands
+from pip.commands.help import HelpCommand
+from pip.exceptions import CommandError
 
 
 def test_run_method_should_return_success_when_finds_command_name():
diff --git a/tests/functional/test_install.py b/tests/functional/test_install.py
index ab22617a4..88a5d1fba 100644
--- a/tests/functional/test_install.py
+++ b/tests/functional/test_install.py
@@ -1,19 +1,17 @@
+import glob
 import os
 import sys
 import textwrap
-import glob
-
-from os.path import join, curdir, pardir
+from os.path import curdir, join, pardir
 
 import pytest
-
 from pip import pep425tags
-from pip.utils import appdirs, rmtree
 from pip.status_codes import ERROR
-from tests.lib import (pyversion, pyversion_tuple,
-                       _create_test_package, _create_svn_repo, path_to_url,
-                       create_test_package_with_setup,
-                       requirements_file)
+from pip.utils import appdirs, rmtree
+from tests.lib import (
+    _create_svn_repo, _create_test_package, create_test_package_with_setup,
+    path_to_url, pyversion, pyversion_tuple, requirements_file
+)
 from tests.lib.local_repos import local_checkout
 from tests.lib.path import Path
 
diff --git a/tests/functional/test_install_cleanup.py b/tests/functional/test_install_cleanup.py
index 49fc5a0ab..36dfedf69 100644
--- a/tests/functional/test_install_cleanup.py
+++ b/tests/functional/test_install_cleanup.py
@@ -1,11 +1,10 @@
 import os
-import pytest
-
 from os.path import exists
 
-from tests.lib.local_repos import local_checkout
+import pytest
 from pip.locations import write_delete_marker_file
 from pip.status_codes import PREVIOUS_BUILD_DIR_ERROR
+from tests.lib.local_repos import local_checkout
 
 
 def test_cleanup_after_install(script, data):
diff --git a/tests/functional/test_install_compat.py b/tests/functional/test_install_compat.py
index d65600524..a16f2e4b9 100644
--- a/tests/functional/test_install_compat.py
+++ b/tests/functional/test_install_compat.py
@@ -3,8 +3,9 @@ Tests for compatibility workarounds.
 
 """
 import os
+
 import pytest
-from tests.lib import pyversion, assert_all_changes
+from tests.lib import assert_all_changes, pyversion
 
 
 @pytest.mark.network
diff --git a/tests/functional/test_install_config.py b/tests/functional/test_install_config.py
index 27d65c4fe..72438162a 100644
--- a/tests/functional/test_install_config.py
+++ b/tests/functional/test_install_config.py
@@ -1,6 +1,7 @@
 import os
 import tempfile
 import textwrap
+
 import pytest
 
 
diff --git a/tests/functional/test_install_extras.py b/tests/functional/test_install_extras.py
index 2dcc4c131..d5b1ded74 100644
--- a/tests/functional/test_install_extras.py
+++ b/tests/functional/test_install_extras.py
@@ -1,7 +1,8 @@
 import textwrap
-import pytest
 from os.path import join
 
+import pytest
+
 
 @pytest.mark.network
 def test_simple_extras_install_from_pypi(script):
diff --git a/tests/functional/test_install_reqs.py b/tests/functional/test_install_reqs.py
index 9526a3ba4..797f1f30a 100644
--- a/tests/functional/test_install_reqs.py
+++ b/tests/functional/test_install_reqs.py
@@ -2,9 +2,9 @@ import os.path
 import textwrap
 
 import pytest
-
-from tests.lib import (pyversion, requirements_file,
-                       _create_test_package_with_subdirectory)
+from tests.lib import (
+    _create_test_package_with_subdirectory, pyversion, requirements_file
+)
 from tests.lib.local_repos import local_checkout
 
 
diff --git a/tests/functional/test_install_upgrade.py b/tests/functional/test_install_upgrade.py
index c477771d8..ec4184eeb 100644
--- a/tests/functional/test_install_upgrade.py
+++ b/tests/functional/test_install_upgrade.py
@@ -3,7 +3,6 @@ import sys
 import textwrap
 
 import pytest
-
 from tests.lib import assert_all_changes, pyversion
 from tests.lib.local_repos import local_checkout
 
diff --git a/tests/functional/test_install_user.py b/tests/functional/test_install_user.py
index e2cb27302..d3a90fcc6 100644
--- a/tests/functional/test_install_user.py
+++ b/tests/functional/test_install_user.py
@@ -3,14 +3,12 @@ tests specific to "pip install --user"
 """
 import os
 import textwrap
-import pytest
-
 from os.path import curdir, isdir, isfile
 
-from pip.compat import uses_pycache, cache_from_source
-
-from tests.lib.local_repos import local_checkout
+import pytest
+from pip.compat import cache_from_source, uses_pycache
 from tests.lib import pyversion
+from tests.lib.local_repos import local_checkout
 
 
 def _patch_dist_in_site_packages(script):
diff --git a/tests/functional/test_install_vcs.py b/tests/functional/test_install_vcs.py
index f554ddbca..220790408 100644
--- a/tests/functional/test_install_vcs.py
+++ b/tests/functional/test_install_vcs.py
@@ -1,7 +1,7 @@
 import pytest
-
-from tests.lib import (_create_test_package, _change_test_package_version,
-                       pyversion)
+from tests.lib import (
+    _change_test_package_version, _create_test_package, pyversion
+)
 from tests.lib.local_repos import local_checkout
 
 
diff --git a/tests/functional/test_install_vcs_git.py b/tests/functional/test_install_vcs_git.py
index d06a4d05a..be200762c 100644
--- a/tests/functional/test_install_vcs_git.py
+++ b/tests/functional/test_install_vcs_git.py
@@ -1,13 +1,10 @@
 import pytest
-
 from mock import patch
-
 from pip.vcs.git import Git
 from tests.lib import _create_test_package
 from tests.lib.git_submodule_helpers import (
-    _change_test_package_submodule,
-    _pull_in_submodule_changes_to_module,
-    _create_test_package_with_submodule,
+    _change_test_package_submodule, _create_test_package_with_submodule,
+    _pull_in_submodule_changes_to_module
 )
 
 
diff --git a/tests/functional/test_install_wheel.py b/tests/functional/test_install_wheel.py
index 2eaee3605..346957433 100644
--- a/tests/functional/test_install_wheel.py
+++ b/tests/functional/test_install_wheel.py
@@ -1,8 +1,8 @@
+import glob
 import os
 import sys
-import pytest
-import glob
 
+import pytest
 from tests.lib.path import Path
 
 
diff --git a/tests/functional/test_list.py b/tests/functional/test_list.py
index e3ddc6993..041270263 100644
--- a/tests/functional/test_list.py
+++ b/tests/functional/test_list.py
@@ -1,5 +1,6 @@
 import json
 import os
+
 import pytest
 
 
diff --git a/tests/functional/test_search.py b/tests/functional/test_search.py
index be99ffbe7..a00460f01 100644
--- a/tests/functional/test_search.py
+++ b/tests/functional/test_search.py
@@ -1,12 +1,10 @@
 import pytest
-from pip.commands.search import (highest_version,
-                                 print_results,
-                                 transform_hits,
-                                 SearchCommand)
+from pip.commands.search import (
+    SearchCommand, highest_version, print_results, transform_hits
+)
 from pip.status_codes import NO_MATCHES_FOUND, SUCCESS
 from tests.lib import pyversion
 
-
 if pyversion >= '3':
     VERBOSE_FALSE = False
 else:
diff --git a/tests/functional/test_uninstall.py b/tests/functional/test_uninstall.py
index 12a36de63..cbcfac4aa 100644
--- a/tests/functional/test_uninstall.py
+++ b/tests/functional/test_uninstall.py
@@ -1,20 +1,18 @@
 from __future__ import with_statement
 
 import json
-import textwrap
 import os
 import sys
-import pytest
-import pretend
-
+import textwrap
 from os.path import join, normpath
 from tempfile import mkdtemp
-from tests.lib import assert_all_changes
-from tests.lib import create_test_package_with_setup
-from tests.lib.local_repos import local_repo, local_checkout
 
+import pretend
+import pytest
 from pip.req import InstallRequirement
 from pip.utils import rmtree
+from tests.lib import assert_all_changes, create_test_package_with_setup
+from tests.lib.local_repos import local_checkout, local_repo
 
 
 @pytest.mark.network
diff --git a/tests/functional/test_uninstall_user.py b/tests/functional/test_uninstall_user.py
index 53606a7b7..ddf21a35d 100644
--- a/tests/functional/test_uninstall_user.py
+++ b/tests/functional/test_uninstall_user.py
@@ -1,11 +1,11 @@
 """
 tests specific to uninstalling --user installs
 """
-import pytest
 from os.path import isdir, isfile
 
-from tests.lib import pyversion, assert_all_changes
+import pytest
 from tests.functional.test_install_user import _patch_dist_in_site_packages
+from tests.lib import assert_all_changes, pyversion
 
 
 class Tests_UninstallUserSite:
diff --git a/tests/functional/test_wheel.py b/tests/functional/test_wheel.py
index a52c1380a..b97f320e0 100644
--- a/tests/functional/test_wheel.py
+++ b/tests/functional/test_wheel.py
@@ -1,9 +1,8 @@
 """'pip wheel' tests"""
 import os
-import pytest
-
 from os.path import exists
 
+import pytest
 from pip.locations import write_delete_marker_file
 from pip.status_codes import ERROR, PREVIOUS_BUILD_DIR_ERROR
 from tests.lib import pyversion
diff --git a/tests/lib/local_repos.py b/tests/lib/local_repos.py
index 059a4c588..39aed6950 100644
--- a/tests/lib/local_repos.py
+++ b/tests/lib/local_repos.py
@@ -5,10 +5,9 @@ import subprocess
 
 from pip._vendor.six.moves.urllib import request as urllib_request
 
-from pip.vcs import subversion, git, bazaar, mercurial
+from pip.vcs import bazaar, git, mercurial, subversion
 from tests.lib import path_to_url
 
-
 if hasattr(subprocess, "check_call"):
     subprocess_call = subprocess.check_call
 else:
diff --git a/tests/lib/path.py b/tests/lib/path.py
index 73577cdf9..d126eb86a 100644
--- a/tests/lib/path.py
+++ b/tests/lib/path.py
@@ -5,15 +5,16 @@ from __future__ import absolute_import
 
 import glob
 import os
-import sys
 import shutil
+import sys
+
+from pip._vendor import six
 
 try:
     from os import supports_fd
 except ImportError:
     supports_fd = set()
 
-from pip._vendor import six
 
 
 _base = six.text_type if os.path.supports_unicode_filenames else str
diff --git a/tests/lib/test_lib.py b/tests/lib/test_lib.py
index 849ad3e63..a5021b1c6 100644
--- a/tests/lib/test_lib.py
+++ b/tests/lib/test_lib.py
@@ -3,7 +3,7 @@ from __future__ import absolute_import
 
 import filecmp
 import re
-from os.path import join, isdir
+from os.path import isdir, join
 
 from tests.lib import SRC_DIR
 
diff --git a/tests/lib/venv.py b/tests/lib/venv.py
index 73a9f7f5d..47e79d7a6 100644
--- a/tests/lib/venv.py
+++ b/tests/lib/venv.py
@@ -1,14 +1,13 @@
 from __future__ import absolute_import
 
 import os
-import sys
 import subprocess
+import sys
 
 import virtualenv as _virtualenv
 
 from .path import Path
 
-
 # On Python < 3.3 we don't have subprocess.DEVNULL
 try:
     DEVNULL = subprocess.DEVNULL
diff --git a/tests/scripts/test_all_pip.py b/tests/scripts/test_all_pip.py
index c0e91ff41..66a8e405e 100644
--- a/tests/scripts/test_all_pip.py
+++ b/tests/scripts/test_all_pip.py
@@ -1,14 +1,13 @@
 import os
 import re
-import sys
 import subprocess
-from os.path import dirname, abspath
+import sys
+from os.path import abspath, dirname
 
 from pip._vendor.six.moves.urllib import request as urllib_request
 
 from pip.utils import rmtree
 
-
 src_folder = dirname(dirname(abspath(__file__)))
 
 if sys.platform == 'win32':
diff --git a/tests/unit/test_appdirs.py b/tests/unit/test_appdirs.py
index 570e3b228..a408fb49d 100644
--- a/tests/unit/test_appdirs.py
+++ b/tests/unit/test_appdirs.py
@@ -4,7 +4,6 @@ import posixpath
 import sys
 
 import pretend
-
 from pip.utils import appdirs
 
 
diff --git a/tests/unit/test_cmdoptions.py b/tests/unit/test_cmdoptions.py
index 30fb15505..60d5c9629 100644
--- a/tests/unit/test_cmdoptions.py
+++ b/tests/unit/test_cmdoptions.py
@@ -1,6 +1,6 @@
 import pip
-from pip.basecommand import Command
 from pip import cmdoptions
+from pip.basecommand import Command
 
 
 class SimpleCommand(Command):
diff --git a/tests/unit/test_compat.py b/tests/unit/test_compat.py
index 92be06146..1d092c331 100644
--- a/tests/unit/test_compat.py
+++ b/tests/unit/test_compat.py
@@ -1,6 +1,7 @@
 import os
-from pip.compat import expanduser, get_path_uid, native_str
+
 import pytest
+from pip.compat import expanduser, get_path_uid, native_str
 
 
 def test_get_path_uid():
diff --git a/tests/unit/test_download.py b/tests/unit/test_download.py
index 1630393f0..a1fc77627 100644
--- a/tests/unit/test_download.py
+++ b/tests/unit/test_download.py
@@ -1,20 +1,19 @@
 import hashlib
 import os
 from io import BytesIO
-from shutil import rmtree, copy
+from shutil import copy, rmtree
 from tempfile import mkdtemp
 
 from pip._vendor.six.moves.urllib import request as urllib_request
 
-from mock import Mock, patch
-import pytest
-
 import pip
-from pip.exceptions import HashMismatch
+import pytest
+from mock import Mock, patch
 from pip.download import (
-    PipSession, SafeFileCache, path_to_url, unpack_http_url, url_to_path,
-    unpack_file_url, MultiDomainBasicAuth
+    MultiDomainBasicAuth, PipSession, SafeFileCache, path_to_url,
+    unpack_file_url, unpack_http_url, url_to_path
 )
+from pip.exceptions import HashMismatch
 from pip.index import Link
 from pip.utils.hashes import Hashes
 
diff --git a/tests/unit/test_finder.py b/tests/unit/test_finder.py
index 24896ed92..732748f9c 100644
--- a/tests/unit/test_finder.py
+++ b/tests/unit/test_finder.py
@@ -1,18 +1,17 @@
-import pytest
 import sys
 
-import pip.wheel
+from pkg_resources import Distribution, parse_version
+
 import pip.pep425tags
-
-from pkg_resources import parse_version, Distribution
-from pip.req import InstallRequirement
-from pip.index import (
-    InstallationCandidate, PackageFinder, Link, FormatControl,
-    fmt_ctl_formats)
-from pip.exceptions import BestVersionAlreadyInstalled, DistributionNotFound
-from pip.download import PipSession
-
+import pip.wheel
+import pytest
 from mock import Mock, patch
+from pip.download import PipSession
+from pip.exceptions import BestVersionAlreadyInstalled, DistributionNotFound
+from pip.index import (
+    FormatControl, InstallationCandidate, Link, PackageFinder, fmt_ctl_formats
+)
+from pip.req import InstallRequirement
 
 
 def test_no_mpkg(data):
diff --git a/tests/unit/test_index.py b/tests/unit/test_index.py
index f25a0c4f8..2125c622e 100644
--- a/tests/unit/test_index.py
+++ b/tests/unit/test_index.py
@@ -1,9 +1,8 @@
 import os.path
-import pytest
 
+import pytest
 from pip.download import PipSession
-from pip.index import HTMLPage
-from pip.index import PackageFinder, Link
+from pip.index import HTMLPage, Link, PackageFinder
 
 
 def test_sort_locations_file_expand_dir(data):
diff --git a/tests/unit/test_locations.py b/tests/unit/test_locations.py
index 0489e55fb..8dce0f60b 100644
--- a/tests/unit/test_locations.py
+++ b/tests/unit/test_locations.py
@@ -2,14 +2,13 @@
 locations.py tests
 
 """
-import os
-import sys
-import shutil
-import tempfile
 import getpass
+import os
+import shutil
+import sys
+import tempfile
 
 from mock import Mock
-
 from pip.locations import distutils_scheme
 
 if sys.platform == 'win32':
diff --git a/tests/unit/test_options.py b/tests/unit/test_options.py
index dfae54023..c976b830b 100644
--- a/tests/unit/test_options.py
+++ b/tests/unit/test_options.py
@@ -1,8 +1,8 @@
 import os
-import pytest
+
 import pip.configuration
-from pip import main
-from pip import cmdoptions
+import pytest
+from pip import cmdoptions, main
 from pip.basecommand import Command
 from pip.commands import commands_dict as commands
 
diff --git a/tests/unit/test_pep425tags.py b/tests/unit/test_pep425tags.py
index 6d12e47fc..3fef08087 100644
--- a/tests/unit/test_pep425tags.py
+++ b/tests/unit/test_pep425tags.py
@@ -1,4 +1,5 @@
 import sys
+
 from mock import patch
 from pip import pep425tags
 
diff --git a/tests/unit/test_proxy.py b/tests/unit/test_proxy.py
index 761712353..c33c8f56e 100644
--- a/tests/unit/test_proxy.py
+++ b/tests/unit/test_proxy.py
@@ -3,7 +3,6 @@ Tests for the proxy support in pip.
 """
 
 import pip
-
 from tests.lib import SRC_DIR
 from tests.lib.path import Path
 
diff --git a/tests/unit/test_req.py b/tests/unit/test_req.py
index 623cabed6..d7bb85429 100644
--- a/tests/unit/test_req.py
+++ b/tests/unit/test_req.py
@@ -3,21 +3,22 @@ import shutil
 import sys
 import tempfile
 
-import pytest
-
-from mock import Mock, patch, mock_open
-from pip.commands.install import InstallCommand
-from pip.exceptions import (PreviousBuildDirError, InvalidWheelFilename,
-                            InstallationError, HashErrors)
-from pip.download import path_to_url, PipSession
-from pip.index import PackageFinder
-from pip.req import (InstallRequirement, RequirementSet, Requirements)
-from pip.req.req_file import process_line
-from pip.req.req_install import parse_editable
-from pip.utils import read_text_file
 from pip._vendor import pkg_resources
 from pip._vendor.packaging.markers import Marker
 from pip._vendor.packaging.requirements import Requirement
+
+import pytest
+from mock import Mock, mock_open, patch
+from pip.commands.install import InstallCommand
+from pip.download import PipSession, path_to_url
+from pip.exceptions import (
+    HashErrors, InstallationError, InvalidWheelFilename, PreviousBuildDirError
+)
+from pip.index import PackageFinder
+from pip.req import InstallRequirement, Requirements, RequirementSet
+from pip.req.req_file import process_line
+from pip.req.req_install import parse_editable
+from pip.utils import read_text_file
 from tests.lib import assert_raises_regexp, requirements_file
 
 
diff --git a/tests/unit/test_req_file.py b/tests/unit/test_req_file.py
index a3fcf7a79..d1e00eea4 100644
--- a/tests/unit/test_req_file.py
+++ b/tests/unit/test_req_file.py
@@ -2,18 +2,18 @@ import os
 import subprocess
 import textwrap
 
-from mock import patch, Mock
-import pytest
-from pretend import stub
-
 import pip
-from pip.exceptions import (InstallationError, RequirementsFileParseError)
+import pytest
+from mock import Mock, patch
 from pip.download import PipSession
+from pip.exceptions import InstallationError, RequirementsFileParseError
 from pip.index import PackageFinder
+from pip.req.req_file import (
+    break_args_options, ignore_comments, join_lines, parse_requirements,
+    preprocess, process_line, skip_regex
+)
 from pip.req.req_install import InstallRequirement
-from pip.req.req_file import (parse_requirements, process_line, join_lines,
-                              ignore_comments, break_args_options, skip_regex,
-                              preprocess)
+from pretend import stub
 from tests.lib import requirements_file
 
 
diff --git a/tests/unit/test_req_install.py b/tests/unit/test_req_install.py
index b956608cf..a24fbf201 100644
--- a/tests/unit/test_req_install.py
+++ b/tests/unit/test_req_install.py
@@ -2,7 +2,6 @@ import os
 import tempfile
 
 import pytest
-
 from pip.req.req_install import InstallRequirement
 
 
diff --git a/tests/unit/test_req_uninstall.py b/tests/unit/test_req_uninstall.py
index 7097ded9d..67ce6634d 100644
--- a/tests/unit/test_req_uninstall.py
+++ b/tests/unit/test_req_uninstall.py
@@ -1,9 +1,8 @@
 import os
 
+import pip.req.req_uninstall
 import pytest
 from mock import Mock
-
-import pip.req.req_uninstall
 from pip.req.req_uninstall import UninstallPathSet, uninstallation_paths
 
 
diff --git a/tests/unit/test_unit_outdated.py b/tests/unit/test_unit_outdated.py
index 24313c8f3..3108cf6b2 100644
--- a/tests/unit/test_unit_outdated.py
+++ b/tests/unit/test_unit_outdated.py
@@ -1,13 +1,13 @@
-import sys
 import datetime
 import os
+import sys
 from contextlib import contextmanager
 
-import freezegun
-import pytest
-import pretend
-
 from pip._vendor import lockfile
+
+import freezegun
+import pretend
+import pytest
 from pip.index import InstallationCandidate
 from pip.utils import outdated
 
diff --git a/tests/unit/test_utils.py b/tests/unit/test_utils.py
index e29d00020..fbb6d89e7 100644
--- a/tests/unit/test_utils.py
+++ b/tests/unit/test_utils.py
@@ -5,26 +5,29 @@ util tests
 
 """
 import os
+import shutil
 import stat
 import sys
-import time
-import shutil
 import tempfile
+import time
 import warnings
 
-import pytest
+from pip._vendor.six import BytesIO
 
+import pytest
 from mock import Mock, patch
-from pip.exceptions import (HashMismatch, HashMissing, InstallationError,
-                            UnsupportedPythonVersion)
-from pip.utils import (egg_link_path, get_installed_distributions,
-                       untar_file, unzip_file, rmtree, normalize_path)
+from pip.exceptions import (
+    HashMismatch, HashMissing, InstallationError, UnsupportedPythonVersion
+)
+from pip.utils import (
+    egg_link_path, get_installed_distributions, normalize_path, rmtree,
+    untar_file, unzip_file
+)
 from pip.utils.build import BuildDirectory
 from pip.utils.encoding import auto_decode
-from pip.utils.hashes import Hashes, MissingHashes
 from pip.utils.glibc import check_glibc_version
+from pip.utils.hashes import Hashes, MissingHashes
 from pip.utils.packaging import check_dist_requires_python
-from pip._vendor.six import BytesIO
 
 
 class Tests_EgglinkPath:
diff --git a/tests/unit/test_vcs.py b/tests/unit/test_vcs.py
index cfcad6410..13e5e876c 100644
--- a/tests/unit/test_vcs.py
+++ b/tests/unit/test_vcs.py
@@ -1,11 +1,12 @@
+from pip._vendor.packaging.version import parse as parse_version
+
 import pytest
-from tests.lib import pyversion
+from mock import Mock
 from pip.vcs import VersionControl
 from pip.vcs.bazaar import Bazaar
 from pip.vcs.git import Git
 from pip.vcs.subversion import Subversion
-from mock import Mock
-from pip._vendor.packaging.version import parse as parse_version
+from tests.lib import pyversion
 
 if pyversion >= '3':
     VERBOSE_FALSE = False
diff --git a/tests/unit/test_wheel.py b/tests/unit/test_wheel.py
index 40e17998f..46182f1ef 100644
--- a/tests/unit/test_wheel.py
+++ b/tests/unit/test_wheel.py
@@ -1,12 +1,12 @@
 """Tests for wheel binary packages and .dist-info."""
 import os
 
-import pytest
-from mock import patch, Mock
-
 from pip._vendor.packaging.requirements import Requirement
+
+import pytest
+from mock import Mock, patch
 from pip import pep425tags, wheel
-from pip.compat import expanduser, WINDOWS
+from pip.compat import WINDOWS, expanduser
 from pip.exceptions import InvalidWheelFilename, UnsupportedWheel
 from pip.utils import unpack_file