Replace `open(file, 'r')` with `open(file)`

setup.py

@@ -11,7 +11,7 @@ def read(rel_path):
     here = os.path.abspath(os.path.dirname(__file__))
     # intentionally *not* adding an encoding option to open, See:
     #   https://github.com/pypa/virtualenv/issues/201#issuecomment-3145690
-    with open(os.path.join(here, rel_path), 'r') as fp:
+    with open(os.path.join(here, rel_path)) as fp:
         return fp.read()
 
 

src/pip/_internal/req/constructors.py

@@ -145,7 +145,7 @@ def deduce_helpful_msg(req):
         msg = " The path does exist. "
         # Try to parse and check if it is a requirements file.
         try:
-            with open(req, 'r') as fp:
+            with open(req) as fp:
                 # parse first line only
                 next(parse_requirements(fp.read()))
                 msg += (

src/pip/_internal/req/req_uninstall.py

@@ -543,7 +543,7 @@ class UninstallPathSet:
 
         elif develop_egg_link:
             # develop egg
-            with open(develop_egg_link, 'r') as fh:
+            with open(develop_egg_link) as fh:
                 link_pointer = os.path.normcase(fh.readline().strip())
             assert (link_pointer == dist.location), (
                 'Egg-link {} does not match installed location of {} '

tests/functional/test_install.py

@@ -1298,7 +1298,7 @@ def test_install_log(script, data, tmpdir):
             'install', data.src.joinpath('chattymodule')]
     result = script.pip(*args)
     assert 0 == result.stdout.count("HELLO FROM CHATTYMODULE")
-    with open(f, 'r') as fp:
+    with open(f) as fp:
         # one from egg_info, one from install
         assert 2 == fp.read().count("HELLO FROM CHATTYMODULE")
 
@@ -1321,7 +1321,7 @@ def test_cleanup_after_failed_wheel(script, with_wheel):
     # One of the effects of not cleaning up is broken scripts:
     script_py = script.bin_path / "script.py"
     assert script_py.exists(), script_py
-    shebang = open(script_py, 'r').readline().strip()
+    shebang = open(script_py).readline().strip()
     assert shebang != '#!python', shebang
     # OK, assert that we *said* we were cleaning up:
     # /!\ if in need to change this, also change test_pep517_no_legacy_cleanup

tests/functional/test_no_color.py

@@ -33,7 +33,7 @@ def test_no_color(script):
             pytest.skip("Unable to capture output using script: " + cmd)
 
         try:
-            with open("/tmp/pip-test-no-color.txt", "r") as output_file:
+            with open("/tmp/pip-test-no-color.txt") as output_file:
                 retval = output_file.read()
             return retval
         finally:

tests/functional/test_vcs_bazaar.py

@@ -64,7 +64,7 @@ def test_export_rev(script, tmpdir):
     url = hide_url('bzr+' + _test_path_to_file_url(source_dir) + '@1')
     Bazaar().export(str(export_dir), url=url)
 
-    with open(export_dir / 'test_file', 'r') as f:
+    with open(export_dir / 'test_file') as f:
         assert f.read() == 'something initial'
 
 

tools/automation/release/__init__.py

@@ -90,7 +90,7 @@ def generate_news(session: Session, version: str) -> None:
 
 
 def update_version_file(version: str, filepath: str) -> None:
-    with open(filepath, "r", encoding="utf-8") as f:
+    with open(filepath, encoding="utf-8") as f:
         content = list(f)
 
     file_modified = False