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Xref: csiph.com comp.lang.python:33313

Ian Kelly <ian.g.kelly@gmail.com> writes:

> On Tue, Nov 13, 2012 at 11:05 PM, Kushal Kumaran
> <kushal.kumaran+python@gmail.com> wrote:
>> Or, you could just change the p1's stderr to an io.BytesIO instance.
>> Then call p2.communicate *first*.
>
> This doesn't seem to work.
>
>>>> b = io.BytesIO()
>>>> p = subprocess.Popen(["ls", "-l"], stdout=b)
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
>   File "/usr/lib64/python3.2/subprocess.py", line 711, in __init__
>     errread, errwrite) = self._get_handles(stdin, stdout, stderr)
>   File "/usr/lib64/python3.2/subprocess.py", line 1112, in _get_handles
>     c2pwrite = stdout.fileno()
> io.UnsupportedOperation: fileno
>
> I think stdout and stderr need to be actual file objects, not just
> file-like objects.

Well, well, I was wrong, clearly.  I wonder if this is fixable.

-- 
regards,
kushal