[docs] [issue34115] code.InteractiveConsole.interact() closes stdin

[Yonatan Zunger]

Yonatan Zunger <zunger at humu.com> added the comment:

Testing your code sample on OS X (10.13.6) with Python 3.6.2:

- quit() in the console yields

Exc 0: closed is True
Python 3.6.2 (default, Apr 17 2018, 12:29:33) 
[GCC 4.2.1 Compatible Apple LLVM 9.1.0 (clang-902.0.39.1)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
(InteractiveConsole)
>>> Traceback (most recent call last):
  File "./test.py", line 6, in <module>
    code.InteractiveConsole().interact()
  File "/Users/zunger/.pyenv/versions/3.6.2/lib/python3.6/code.py", line 228, in interact
    line = self.raw_input(prompt)
  File "/Users/zunger/.pyenv/versions/3.6.2/lib/python3.6/code.py", line 275, in raw_input
    return input(prompt)
ValueError: I/O operation on closed file.

- ^D and raise SystemExit in console both yield:

Python 3.6.2 (default, Apr 17 2018, 12:29:33) 
[GCC 4.2.1 Compatible Apple LLVM 9.1.0 (clang-902.0.39.1)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
(InteractiveConsole)
>>> ^D
now exiting InteractiveConsole...
Try 0: closed is False
Python 3.6.2 (default, Apr 17 2018, 12:29:33) 
[GCC 4.2.1 Compatible Apple LLVM 9.1.0 (clang-902.0.39.1)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
(InteractiveConsole)
>>> ^D
now exiting InteractiveConsole...
Try 1: closed is False


So it looks like the issue is specific to quit(), as you say. I'm not sure I understand what the purpose of the sys.stdin.close() call is, though: why would we *want* to alert the parent shell in some way beyond a SystemExit as the default (non-overrideable) behavior? This may be a documentation issue, but it seems extremely surprising to me; no other function does this additional thing, even when raising a SystemExit. I would think that any caller which is running InteractiveConsole.interact() and also wants to do something when it finishes would want to handle that additional logic itself.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34115>
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