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Clarify python_version parser behavior #21498

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Clarify python_version parser behavior #21498

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5 changes: 5 additions & 0 deletions docs/source/command_line.rst
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Expand Up @@ -267,6 +267,11 @@ For more information on how to use these flags, see :ref:`version_and_platform_c
run under Python version X.Y. Without this option, mypy will default to using
whatever version of Python is running mypy.

This flag affects type checking behavior such as version and platform
checks, but mypy still uses the parser from the Python interpreter running
mypy. To type check code using syntax from a newer Python version, run mypy
with an interpreter that supports that syntax.

This flag will attempt to find a Python executable of the corresponding
version to search for :pep:`561` compliant packages. If you'd like to
disable this, use the :option:`--no-site-packages` flag (see
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5 changes: 5 additions & 0 deletions docs/source/config_file.rst
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Expand Up @@ -435,6 +435,11 @@ Platform configuration
for example ``3.10``. The default is the version of the Python
interpreter used to run mypy.

This setting affects type checking behavior such as version and platform
checks, but mypy still uses the parser from the Python interpreter running
mypy. To type check code using syntax from a newer Python version, run mypy
with an interpreter that supports that syntax.

This option may only be set in the global section (``[mypy]``).

.. confval:: platform
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