[Bug 1549176] [NEW] gevent.subprocess does not work because MAXFD is not defined in Python 3.5

[Dato Simó]

Public bug reported:

This is for the python3-gevent in xenial (1.1~b1-0ubuntu2).

The gevent.subprocess module imports a list of symbols from
the standard library’s subprocess, but Python 3.5 removed
subprocess.MAXFD, producing this error:

$ python3
Python 3.5.1+ (default, Jan 13 2016, 15:09:18)
[GCC 5.3.1 20160112] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from gevent import subprocess
>>> subprocess.call(["echo"])
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python3/dist-packages/gevent/subprocess.py", line 125, in call
    with Popen(*popenargs, **kwargs) as p:
  File "/usr/lib/python3/dist-packages/gevent/subprocess.py", line 396, in __init__
    restore_signals, start_new_session)
  File "/usr/lib/python3/dist-packages/gevent/subprocess.py", line 1079, in _execute_child
    raise child_exception
NameError: name 'MAXFD' is not defined
>>>


This is seemingly fixed upstream: https://github.com/gevent/gevent/issues/653

** Affects: python-gevent (Ubuntu)
     Importance: Undecided
         Status: New

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Title:
  gevent.subprocess does not work because MAXFD is not defined in Python
  3.5

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