[issue11709] help-method crashes if sys.stdin is None

[Palm Kevin]

New submission from Palm Kevin <kevin.palm at labsolution.lu>:

The interactive help-method provided by python crashes when no stdin-stream is available (sys.stdin == None).
Exception:
  Traceback (most recent call last):
    File "MyScript", line 4, in <module>
    File "C:\Python32\lib\site.py", line 457, in __call__
      return pydoc.help(*args, **kwds)
    File "C:\Python32\lib\pydoc.py", line 1748, in __call__
      self.help(request)
    File "C:\Python32\lib\pydoc.py", line 1795, in help
      else: doc(request, 'Help on %s:', output=self._output)
    File "C:\Python32\lib\pydoc.py", line 1537, in doc
      pager(render_doc(thing, title, forceload))
    File "C:\Python32\lib\pydoc.py", line 1345, in pager
      pager = getpager()
    File "C:\Python32\lib\pydoc.py", line 1352, in getpager
      if not sys.stdin.isatty() or not sys.stdout.isatty():
  AttributeError: 'NoneType' object has no attribute 'isatty'


I think that this situation should be handled:
 - either by raising a clear error message indicating that help cannot be displayed because Python is executing in a non-interactive mode
 - either by simply printing documentation to stdout (like this: "print(sys.__doc__)")

----------
messages: 132474
nosy: palm.kevin
priority: normal
severity: normal
status: open
title: help-method crashes if sys.stdin is None

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue11709>
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