sort imports properly

src/pip/_internal/cli/cmdoptions.py

@@ -14,8 +14,8 @@ from functools import partial
 from optparse import SUPPRESS_HELP, Option, OptionGroup
 
 from pip._internal.exceptions import CommandError
-from pip._internal.models.format_control import FormatControl
 from pip._internal.locations import USER_CACHE_DIR, src_prefix
+from pip._internal.models.format_control import FormatControl
 from pip._internal.models.index import PyPI
 from pip._internal.utils.hashes import STRONG_HASHES
 from pip._internal.utils.typing import MYPY_CHECK_RUNNING

src/pip/_internal/index.py

@@ -25,8 +25,8 @@ from pip._internal.exceptions import (
     BestVersionAlreadyInstalled, DistributionNotFound, InvalidWheelFilename,
     UnsupportedWheel,
 )
-from pip._internal.models.format_control import FormatControl
 from pip._internal.models.candidate import InstallationCandidate
+from pip._internal.models.format_control import FormatControl
 from pip._internal.models.index import PyPI
 from pip._internal.models.link import Link
 from pip._internal.pep425tags import get_supported

tests/unit/test_format_control.py

@@ -1,4 +1,5 @@
 import pytest
+
 from pip._internal.cli import cmdoptions
 from pip._internal.cli.base_command import Command
 from pip._internal.models.format_control import FormatControl

tests/unit/test_req_file.py

@@ -11,8 +11,8 @@ from pip._internal.download import PipSession
 from pip._internal.exceptions import (
     InstallationError, RequirementsFileParseError,
 )
-from pip._internal.models.format_control import FormatControl
 from pip._internal.index import PackageFinder
+from pip._internal.models.format_control import FormatControl
 from pip._internal.req.constructors import (
     install_req_from_editable, install_req_from_line,
 )