Remove --no-python-version-warning as Python 2 is dead

Author: ichard26

news/13154.removal.rst

@@ -0,0 +1,2 @@
+Remove the ``no-python-version-warning`` flag as it was a relic of the Python
+2 sunset transition.

src/pip/_internal/cli/cmdoptions.py

@@ -983,17 +983,6 @@ def check_list_path_option(options: Values) -> None:
     help="Exclude specified package from the output",
 )
 
-
-no_python_version_warning: Callable[..., Option] = partial(
-    Option,
-    "--no-python-version-warning",
-    dest="no_python_version_warning",
-    action="store_true",
-    default=False,
-    help="Silence deprecation warnings for upcoming unsupported Pythons.",
-)
-
-
 # Features that are now always on. A warning is printed if they are used.
 ALWAYS_ENABLED_FEATURES = [
     "truststore",  # always on since 24.2
@@ -1058,7 +1047,6 @@ def check_list_path_option(options: Values) -> None:
         no_cache,
         disable_pip_version_check,
         no_color,
-        no_python_version_warning,
         use_new_feature,
         use_deprecated_feature,
     ],

tests/functional/test_warning.py

@@ -43,24 +43,6 @@ def test_deprecation_warnings_can_be_silenced(
     assert result.stderr == ""
 
 
-DEPRECATION_TEXT = "drop support for Python 2.7"
-CPYTHON_DEPRECATION_TEXT = "January 1st, 2020"
-
-
-def test_version_warning_is_not_shown_if_python_version_is_not_2(
-    script: PipTestEnvironment,
-) -> None:
-    result = script.pip("debug", allow_stderr_warning=True)
-    assert DEPRECATION_TEXT not in result.stderr, str(result)
-    assert CPYTHON_DEPRECATION_TEXT not in result.stderr, str(result)
-
-
-def test_flag_does_nothing_if_python_version_is_not_2(
-    script: PipTestEnvironment,
-) -> None:
-    script.pip("list", "--no-python-version-warning")
-
-
 @pytest.mark.skipif(
     sys.version_info >= (3, 10), reason="distutils is deprecated in 3.10+"
 )