id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
32202	django-admin runserver and get_child_arguments() crashes on Windows and Python < 3.8.	andrey-zotov	Carlton Gibson	"""django-admin runserver"" fails with the following error:

{{{
Traceback (most recent call last):
  File ""c:\users\someone\appdata\local\programs\python\python37\lib\runpy.py"", line 193, in _run_module_as_main
    ""__main__"", mod_spec)
  File ""c:\users\someone\appdata\local\programs\python\python37\lib\runpy.py"", line 85, in _run_code
    exec(code, run_globals)
  File ""C:\Users\someone\AppData\Local\Programs\Python\Python37\Scripts\django-admin.exe\__main__.py"", line 7, in <module>
  File ""c:\users\someone\appdata\local\programs\python\python37\lib\site-packages\django\core\management\__init__.py"", line 401, in execute_from_command_line
    utility.execute()
  File ""c:\users\someone\appdata\local\programs\python\python37\lib\site-packages\django\core\management\__init__.py"", line 395, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File ""c:\users\someone\appdata\local\programs\python\python37\lib\site-packages\django\core\management\base.py"", line 330, in run_from_argv
    self.execute(*args, **cmd_options)
  File ""c:\users\someone\appdata\local\programs\python\python37\lib\site-packages\django\core\management\commands\runserver.py"", line 61, in execute
    super().execute(*args, **options)
  File ""c:\users\someone\appdata\local\programs\python\python37\lib\site-packages\django\core\management\base.py"", line 371, in execute
    output = self.handle(*args, **options)
  File ""c:\users\someone\appdata\local\programs\python\python37\lib\site-packages\django\core\management\commands\runserver.py"", line 96, in handle
    self.run(**options)
  File ""c:\users\someone\appdata\local\programs\python\python37\lib\site-packages\django\core\management\commands\runserver.py"", line 103, in run
    autoreload.run_with_reloader(self.inner_run, **options)
  File ""c:\users\someone\appdata\local\programs\python\python37\lib\site-packages\django\utils\autoreload.py"", line 616, in run_with_reloader
    exit_code = restart_with_reloader()
  File ""c:\users\someone\appdata\local\programs\python\python37\lib\site-packages\django\utils\autoreload.py"", line 244, in restart_with_reloader
    p = subprocess.run(args, env=new_environ, close_fds=False)
  File ""c:\users\someone\appdata\local\programs\python\python37\lib\subprocess.py"", line 488, in run
    with Popen(*popenargs, **kwargs) as process:
  File ""c:\users\someone\appdata\local\programs\python\python37\lib\subprocess.py"", line 800, in __init__
    restore_signals, start_new_session)
  File ""c:\users\someone\appdata\local\programs\python\python37\lib\subprocess.py"", line 1148, in _execute_child
    args = list2cmdline(args)
  File ""c:\users\someone\appdata\local\programs\python\python37\lib\subprocess.py"", line 555, in list2cmdline
    needquote = ("" "" in arg) or (""\t"" in arg) or not arg
TypeError: argument of type 'WindowsPath' is not iterable
}}}

Environment:
Windows 10
Python: 3.7.6
Django: 3.1.3

Steps to reproduce:
{{{
django-admin startproject mysite
set PYTHONPATH=<thelocaldir>
django-admin runserver --settings=mysite.settings
}}}

Apparently django.utils.autoreload.get_child_arguments returns WindowsPath(""C:\Users\someone\AppData\Local\Programs\Python\Python37\Scripts\django-admin.exe"") as the first argument,
and subprocess.Popen expects a string and is not able to use Path.

The following monkey-patch fixes the error:
{{{
def get_child_arguments_override():
    args = autoreload._get_child_arguments()
    for i, arg in enumerate(args):
        if isinstance(arg, Path):
            args[i] = str(arg)
    return args

autoreload._get_child_arguments = autoreload.get_child_arguments
autoreload.get_child_arguments = get_child_arguments_override
}}}
"	Bug	closed	Core (Management commands)	3.1	Release blocker	fixed		Carlton Gibson Tom Forbes	Ready for checkin	1	0	0	0	0	0