Merge pull request #9757 from pradyunsg/update-__main__

Blacken __main__.py

.pre-commit-config.yaml

@@ -30,7 +30,6 @@ repos:
         ^src/pip/_internal/req|
         ^src/pip/_internal/vcs|
         ^src/pip/_internal/\w+\.py$|
-        ^src/pip/__main__.py$|
         ^tools/|
         # Tests
         ^tests/conftest.py|

src/pip/__main__.py

@@ -5,12 +5,12 @@
 # of sys.path, if present to avoid using current directory
 # in pip commands check, freeze, install, list and show,
 # when invoked as python -m pip <command>
-if sys.path[0] in ('', os.getcwd()):
+if sys.path[0] in ("", os.getcwd()):
     sys.path.pop(0)
 
 # If we are running from a wheel, add the wheel to sys.path
 # This allows the usage python pip-*.whl/pip install pip-*.whl
-if __package__ == '':
+if __package__ == "":
     # __file__ is pip-*.whl/pip/__main__.py
     # first dirname call strips of '/__main__.py', second strips off '/pip'
     # Resulting path is the name of the wheel itself
@@ -20,5 +20,5 @@
 
 from pip._internal.cli.main import main as _main
 
-if __name__ == '__main__':
+if __name__ == "__main__":
     sys.exit(_main())