New submission from Chris Jerdonek:
Popen.communicate() raises an exception if passed no input when stdin=PIPE and
universal_newlines=True. With universal_newlines=False, no exception is
raised. For example, the following yields--
args = [sys.executable, '-c', 'pass']
popen = Popen(args, universal_newlines=False, stdin=PIPE, stdout=PIPE,
stderr=PIPE)
print(popen.communicate())
popen = Popen(args, universal_newlines=True, stdin=PIPE, stdout=PIPE,
stderr=PIPE)
print(popen.communicate())
(b'', b'[41449 refs]\n')
Traceback (most recent call last):
...
File ".../Lib/subprocess.py", line 1581, in _communicate_with_poll
self._input = self._input.encode(self.stdin.encoding)
AttributeError: 'NoneType' object has no attribute 'encode'
It seems like communicate() should not be trying to encode input if there is
none.
I can provide a patch with tests if it is agreed this is an issue (along with a
fix assuming it is reasonable).
----------
components: Library (Lib)
messages: 167694
nosy: cjerdonek
priority: normal
severity: normal
stage: test needed
status: open
title: subprocess.communicate() breaks on no input with universal newlines true
type: behavior
versions: Python 3.3
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue15592>
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