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gh-47937: Note that Popen attributes are read-only#93070

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gpshead merged 3 commits intopython:mainfromslateny:s/47937
Feb 8, 2023
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23 changes: 12 additions & 11 deletionsDoc/library/subprocess.rst
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Original file line numberDiff line numberDiff line change
Expand Up@@ -450,7 +450,7 @@ functions.
- :const:`0` means unbuffered (read and write are one
system call and can return short)
- :const:`1` means line buffered
(only usable if ``universal_newlines=True``i.e., in a text mode)
(only usable if ``text=True``or ``universal_newlines=True``)
- any other positive value means use a buffer of approximately that
size
- negative bufsize (the default) means the system default of
Expand DownExpand Up@@ -839,7 +839,8 @@ Instances of the :class:`Popen` class have the following methods:
On Windows :meth:`kill` is an alias for :meth:`terminate`.


The following attributes are also available:
The following attributes are also set by the class for you to access.
Reassigning them to new values is unsupported:

.. attribute:: Popen.args

Expand All@@ -852,29 +853,29 @@ The following attributes are also available:

If the *stdin* argument was :data:`PIPE`, this attribute is a writeable
stream object as returned by :func:`open`. If the *encoding* or *errors*
arguments were specified or the *universal_newlines* argument was ``True``,
the stream is a text stream, otherwise it is a byte stream. If the *stdin*
argument was not :data:`PIPE`, this attribute is ``None``.
arguments were specified or the *text* or *universal_newlines* argument
was ``True``,the stream is a text stream, otherwise it is a byte stream.
If the *stdin*argument was not :data:`PIPE`, this attribute is ``None``.


.. attribute:: Popen.stdout

If the *stdout* argument was :data:`PIPE`, this attribute is a readable
stream object as returned by :func:`open`. Reading from the stream provides
output from the child process. If the *encoding* or *errors* arguments were
specified or the *universal_newlines* argument was ``True``, the stream is a
text stream, otherwise it is a byte stream. If the *stdout* argument was not
:data:`PIPE`, this attribute is ``None``.
specified or the *text* or *universal_newlines* argument was ``True``, the
stream is atext stream, otherwise it is a byte stream. If the *stdout*
argument was not:data:`PIPE`, this attribute is ``None``.


.. attribute:: Popen.stderr

If the *stderr* argument was :data:`PIPE`, this attribute is a readable
stream object as returned by :func:`open`. Reading from the stream provides
error output from the child process. If the *encoding* or *errors* arguments
were specified or the *universal_newlines* argument was ``True``, the stream
is a text stream, otherwise it is a byte stream. If the *stderr* argument was
not :data:`PIPE`, this attribute is ``None``.
were specified or the *text* or *universal_newlines* argument was ``True``, the
streamis a text stream, otherwise it is a byte stream. If the *stderr* argument
wasnot :data:`PIPE`, this attribute is ``None``.

.. warning::

Expand Down

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