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Nov 8, 2022
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gh-99238: clarify the type of the env dict. #99253

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10 changes: 7 additions & 3 deletions Doc/library/subprocess.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -81,8 +81,10 @@ underlying :class:`Popen` interface can be used directly.

If *env* is not ``None``, it must be a mapping that defines the environment
variables for the new process; these are used instead of the default
behavior of inheriting the current process' environment. It is passed directly
to :class:`Popen`.
behavior of inheriting the current process' environment. It is passed
directly to :class:`Popen`. This mapping can be str to str on any platform
or bytes to bytes on POSIX platforms much like :data:`os.environ` or
:data:`os.environb`.

Examples::

Expand Down Expand Up @@ -619,7 +621,9 @@ functions.

If *env* is not ``None``, it must be a mapping that defines the environment
variables for the new process; these are used instead of the default
behavior of inheriting the current process' environment.
behavior of inheriting the current process' environment. This mapping can be
str to str on any platform or bytes to bytes on POSIX platforms much like
:data:`os.environ` or :data:`os.environb`.

.. note::

Expand Down