merge 3.3 (#17814)
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@ -715,21 +715,29 @@ The following attributes are also available:
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.. attribute:: Popen.stdin
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If the *stdin* argument was :data:`PIPE`, this attribute is a :term:`file
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object` that provides input to the child process. Otherwise, it is ``None``.
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If the *stdin* argument was :data:`PIPE`, this attribute is a writeable
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stream object as returned by :func:`open`. If the *universal_newlines*
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argument was ``True``, the stream is a text stream, otherwise it is a byte
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stream. If the *stdin* argument was not :data:`PIPE`, this attribute is
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``None``.
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.. attribute:: Popen.stdout
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If the *stdout* argument was :data:`PIPE`, this attribute is a :term:`file
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object` that provides output from the child process. Otherwise, it is ``None``.
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If the *stdout* argument was :data:`PIPE`, this attribute is a readable
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stream object as returned by :func:`open`. Reading from the stream provides
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output from the child process. If the *universal_newlines* argument was
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``True``, the stream is a text stream, otherwise it is a byte stream. If the
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*stdout* argument was not :data:`PIPE`, this attribute is ``None``.
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.. attribute:: Popen.stderr
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If the *stderr* argument was :data:`PIPE`, this attribute is a :term:`file
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object` that provides error output from the child process. Otherwise, it is
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``None``.
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If the *stderr* argument was :data:`PIPE`, this attribute is a readable
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stream object as returned by :func:`open`. Reading from the stream provides
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error output from the child process. If the *universal_newlines* argument was
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``True``, the stream is a text stream, otherwise it is a byte stream. If the
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*stderr* argument was not :data:`PIPE`, this attribute is ``None``.
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.. attribute:: Popen.pid
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