Remove unnecessary "noqa" comments

src/pip/__main__.py

@@ -18,7 +18,7 @@ if __package__ == '':
     path = os.path.dirname(os.path.dirname(__file__))
     sys.path.insert(0, path)
 
-from pip._internal.cli.main import main as _main  # isort:skip # noqa
+from pip._internal.cli.main import main as _main
 
 if __name__ == '__main__':
     sys.exit(_main())

src/pip/_internal/network/auth.py

@@ -31,7 +31,7 @@ if MYPY_CHECK_RUNNING:
 logger = logging.getLogger(__name__)
 
 try:
-    import keyring  # noqa
+    import keyring
 except ImportError:
     keyring = None
 except Exception as exc:

src/pip/_internal/req/req_set.py

@@ -24,7 +24,7 @@ class RequirementSet:
         """Create a RequirementSet.
         """
 
-        self.requirements = OrderedDict()  # type: Dict[str, InstallRequirement]  # noqa: E501
+        self.requirements = OrderedDict()  # type: Dict[str, InstallRequirement]
         self.check_supported_wheels = check_supported_wheels
 
         self.unnamed_requirements = []  # type: List[InstallRequirement]
@@ -69,7 +69,7 @@ class RequirementSet:
         parent_req_name=None,  # type: Optional[str]
         extras_requested=None  # type: Optional[Iterable[str]]
     ):
-        # type: (...) -> Tuple[List[InstallRequirement], Optional[InstallRequirement]]  # noqa: E501
+        # type: (...) -> Tuple[List[InstallRequirement], Optional[InstallRequirement]]
         """Add install_req as a requirement to install.
 
         :param parent_req_name: The name of the requirement that needed this

src/pip/_internal/utils/logging.py

@@ -45,7 +45,7 @@ if WINDOWS:
     # https://bugs.python.org/issue30418
     def _is_broken_pipe_error(exc_class, exc):
         """See the docstring for non-Windows below."""
-        return ((exc_class is BrokenPipeError) or  # noqa: F821
+        return ((exc_class is BrokenPipeError) or
                 (exc_class is OSError and
                  exc.errno in (errno.EINVAL, errno.EPIPE)))
 else:
@@ -58,7 +58,7 @@ else:
           exc_class: an exception class.
           exc: an exception instance.
         """
-        return (exc_class is BrokenPipeError)  # noqa: F821
+        return (exc_class is BrokenPipeError)
 
 
 @contextlib.contextmanager

src/pip/_internal/utils/misc.py

@@ -170,9 +170,7 @@ def path_to_display(path):
     except UnicodeDecodeError:
         # Include the full bytes to make troubleshooting easier, even though
         # it may not be very human readable.
-        # Silence the "F821 undefined name 'ascii'" flake8 error since
-        # ascii() is a built-in.
-        display_path = ascii(path)  # noqa: F821
+        display_path = ascii(path)
 
     return display_path