When debugging uwsgi logging issues with python3.7 i got this on python 3.7.2:
Traceback (most recent call last):
  File "/usr/lib/python3.7/logging/__init__.py", line 269, in _after_at_fork_weak_calls
    _at_fork_weak_calls('release')
  File "/usr/lib/python3.7/logging/__init__.py", line 261, in _at_fork_weak_calls
    method_name, "method:", err, file=sys.stderr)
  File "/usr/lib/python3.7/logging/__init__.py", line 1066, in __repr__
    name = name + ' '
TypeError: unsupported operand type(s) for +: 'int' and 'str'

AFAICS uwsgi creates sys.stderr as an unbuffered file with PyFile_FromFd() and sets it to sys dict.

I'm not sure this is a problem with logging. The code immediately preceding the failure is:

    name = getattr(self.stream, 'name', '')
    if name:
        name += ' '

So, the failure occurs because the stream has a name attribute which is not a string. Even if sys.stderr itself is an unbuffered file, why is its 'name' attribute not a string? I don't imagine the name would be actually used for I/O, and having it set to an integer is a surprise.

I propose to close this (and the associated PR) unless a good reason is given why we have to support non-string names here.

Yeah, I'm not sure the pr is just papering over the real issue :) Need to check what io.open sets on name. IF it setting the fd as name instead of creating a string that would be still be a bug in Python to me. Could you please wait a bit for me to check that before closing?

In Python 3.7.2:

>>> open(2, 'a')
<_io.TextIOWrapper name=2 mode='a' encoding='UTF-8'>
>>> m = _
>>> m.name
2
>>> type(_)
<class 'int'>

That is, when opening a file descriptor the name is set to the value of that file descriptor as an integer.

BTW. The implementation of PyFile_FromFd is a thin wrapper around the open function.

> That is, when opening a file descriptor the name is set to the value of that file descriptor as an integer.

I see. But I wonder if there is anything that relies on the name being an integer? It seems pretty counter-intuitive for a 'name' attribute to be set to something other than a string.

Looking at Modules/_io/fileio.c::_io_FileIO___init___impl it seems an int for nameobj is just fine. Not sure I am looking at the right code though :)

@Vinay Do you have any update on this? thanks

Sorry, Riccardo, been very busy lately and not had time to look at it :-( Soon, I hope.

Friendly ping, would be helpful to get this resolved for 3.8.0. Thanks!

New changeset ca87eebb22d202c33f3317cbf85059cadc64fa9f by Vinay Sajip (Riccardo Magliocchetti) in branch 'master':
bpo-36015: Handle StreamHandler representaton of stream with an integer name (GH-11908)
https://github.com/python/cpython/commit/ca87eebb22d202c33f3317cbf85059cadc64fa9f

New changeset 78dd781ef4d41dfefad53aa3bc52c39b0d443b19 by Vinay Sajip (Miss Islington (bot)) in branch '3.7':
bpo-36015: Handle StreamHandler representaton of stream with an integer name (GH-11908) (GH-13183)
https://github.com/python/cpython/commit/78dd781ef4d41dfefad53aa3bc52c39b0d443b19