Terry J. Reedy added the comment:
Mark, you did not specify which of the variations you tried ;-) I reproduce as
I said in my last message.
C:\Programs\Python34>pythonw -m idlelib
Python 3.4.1 (v3.4.1:c0e311e010fc, May 18 2014, 10:45:13) [
>>> import subprocess
>>> p = subprocess.Popen(["python", "-c", "print(32)"], stdin=None,
stdout=subprocess.PIPE, stderr=subprocess.PIPE)
Traceback (most recent call last):
...
_winapi.DUPLICATE_SAME_ACCESS)
OSError: [WinError 6] The handle is invalid
Change startup command from pythonw to python, no error, and it runs.
>>> p.communicate()
(b'32\r\n', b'')
----------
stage: test needed -> needs patch
versions: +Python 3.4, Python 3.5 -Python 3.2, Python 3.3
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<http://bugs.python.org/issue3905>
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