Martin Panter added the comment:
The current exception seems to give a reasonable hint:
>>> subprocess.Popen((executable,), stdout=BytesIO())
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/lib/python3.5/subprocess.py", line 914, in __init__
errread, errwrite) = self._get_handles(stdin, stdout, stderr)
File "/usr/lib/python3.5/subprocess.py", line 1400, in _get_handles
c2pwrite = stdout.fileno()
io.UnsupportedOperation: fileno
Perhaps we can close this in favour of fixing the documentation? (Issue 19992)
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