createsuperuser management command crash on Python 3.13 when cannot be found in the OS.

[Mariusz Felisiak]

The createsuperuser management command raises OSError when a username isn't found in the system while using Python 3.13.

getpass.getuser() in Python 3.13 catches ImportError and KeyError the same way Django does, but raises OSError instead: ​https://github.com/python/cpython/commit/99a73c3465a45fe57cac01a917fc50e0743b5964

# Reproduction steps

Run bash in a python:3.13 docker container to mount a directory owned by the local user to get a writable directory:

docker run --rm -it -u 1000:1000 -e HOME=/home/user -v $PWD:/home/user python:3.13 bash

Install Django:

pip install --user django

Create a project and run migration:

mkdir -p ~/djtest
~/.local/bin/django-admin startproject djtest /home/user/djtest
~/djtest/manage.py migrate

Create superuser:

~/djtest/manage.py createsuperuser

Exception output:

Traceback (most recent call last):
  File "/usr/local/lib/python3.13/getpass.py", line 173, in getuser
    return pwd.getpwuid(os.getuid())[0]
           ~~~~~~~~~~~~^^^^^^^^^^^^^
KeyError: 'getpwuid(): uid not found: 1000'

The above exception was the direct cause of the following exception:

...
  File "/usr/local/lib/python3.13/getpass.py", line 175, in getuser
    raise OSError('No username set in the environment') from e
OSError: No username set in the environment

Reported originally by tweekmonster.

[Mariusz Felisiak]

​PR

[GitHub <noreply@…>]

In c635decb:

Fixed #35942 -- Fixed createsuperuser crash on Python 3.13+ when username is unavailable.

Thanks Mariusz Felisiak and Jacob Tyler Walls for reviews.

[Natalia <124304+nessita@…>]

In 4b26240:

[5.1.x] Fixed #35942 -- Fixed createsuperuser crash on Python 3.13+ when username is unavailable.

Thanks Mariusz Felisiak and Jacob Tyler Walls for reviews.

Backport of c635decb00ac957daf81c08541cdc9cf46f6d86d from main.