gh-47937: Note that Popen attributes are read-only #93070
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#47937
https://docs.python.org/3/library/subprocess.html#subprocess.Popen.args
Couldn't find the mentioned
__setattr__, but for example, Popen's stdin is set byp2cwrite, which is given by the argument'sstdin, which gets set by_get_handlesby platform. All this seems to imply that the attributes are not intended to be set other than from the constructor.