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
30215	`AttributeError: __spec__` on `./manage.py runserver`	Flaviu Tamas	Florian Moussous	"I get a `AttributeError: __spec__` when I try using the live server. Here's the full stack trace:


{{{
$ pipenv run ./manage.py runserver
Watchman unavailable: pywatchman not installed.
Watching for file changes with StatReloader
Performing system checks…

Traceback (most recent call last):
  File ""/home/user/etc/.virtualenvs/inventory-HrJj1m_g/lib/python3.7/site-packages/py/_vendored_packages/apipkg.py"", line 141, in __makeattr
    modpath, attrname = self.__map__[name]
KeyError: '__spec__'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File ""/home/user/dev/inventory/manage.py"", line 15, in <module>
    execute_from_command_line(sys.argv)
  File ""/home/user/etc/.virtualenvs/inventory-HrJj1m_g/lib/python3.7/site-packages/django/core/management/__init__.py"", line 381, in execute_from_command_line
    utility.execute()
  File ""/home/user/etc/.virtualenvs/inventory-HrJj1m_g/lib/python3.7/site-packages/django/core/management/__init__.py"", line 375, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File ""/home/user/etc/.virtualenvs/inventory-HrJj1m_g/lib/python3.7/site-packages/django/core/management/base.py"", line 323, in run_from_argv
    self.execute(*args, **cmd_options)
  File ""/home/user/etc/.virtualenvs/inventory-HrJj1m_g/lib/python3.7/site-packages/django/core/management/commands/runserver.py"", line 60, in execute
    super().execute(*args, **options)
  File ""/home/user/etc/.virtualenvs/inventory-HrJj1m_g/lib/python3.7/site-packages/django/core/management/base.py"", line 364, in execute
    output = self.handle(*args, **options)
  File ""/home/user/etc/.virtualenvs/inventory-HrJj1m_g/lib/python3.7/site-packages/django/core/management/commands/runserver.py"", line 95, in handle
    self.run(**options)
  File ""/home/user/etc/.virtualenvs/inventory-HrJj1m_g/lib/python3.7/site-packages/django/core/management/commands/runserver.py"", line 102, in run
    autoreload.run_with_reloader(self.inner_run, **options)
  File ""/home/user/etc/.virtualenvs/inventory-HrJj1m_g/lib/python3.7/site-packages/django/utils/autoreload.py"", line 579, in run_with_reloader
    start_django(reloader, main_func, *args, **kwargs)
  File ""/home/user/etc/.virtualenvs/inventory-HrJj1m_g/lib/python3.7/site-packages/django/utils/autoreload.py"", line 564, in start_django
    reloader.run(django_main_thread)
  File ""/home/user/etc/.virtualenvs/inventory-HrJj1m_g/lib/python3.7/site-packages/django/utils/autoreload.py"", line 275, in run
    self.run_loop()
  File ""/home/user/etc/.virtualenvs/inventory-HrJj1m_g/lib/python3.7/site-packages/django/utils/autoreload.py"", line 281, in run_loop
    next(ticker)
  File ""/home/user/etc/.virtualenvs/inventory-HrJj1m_g/lib/python3.7/site-packages/django/utils/autoreload.py"", line 321, in tick
    state.update(self.loop_files(state, previous_timestamp))
  File ""/home/user/etc/.virtualenvs/inventory-HrJj1m_g/lib/python3.7/site-packages/django/utils/autoreload.py"", line 328, in loop_files
    for path, mtime in self.snapshot_files():
  File ""/home/user/etc/.virtualenvs/inventory-HrJj1m_g/lib/python3.7/site-packages/django/utils/autoreload.py"", line 348, in snapshot_files
    for file in self.watched_files():
  File ""/home/user/etc/.virtualenvs/inventory-HrJj1m_g/lib/python3.7/site-packages/django/utils/autoreload.py"", line 241, in watched_files
    yield from iter_all_python_module_files()
  File ""/home/user/etc/.virtualenvs/inventory-HrJj1m_g/lib/python3.7/site-packages/django/utils/autoreload.py"", line 103, in iter_all_python_module_files
    return iter_modules_and_files(modules, frozenset(_error_files))
  File ""/home/user/etc/.virtualenvs/inventory-HrJj1m_g/lib/python3.7/site-packages/django/utils/autoreload.py"", line 114, in iter_modules_and_files
    if not isinstance(module, ModuleType) or module.__spec__ is None:
  File ""/home/user/etc/.virtualenvs/inventory-HrJj1m_g/lib/python3.7/site-packages/py/_vendored_packages/apipkg.py"", line 146, in __makeattr
    raise AttributeError(name)
AttributeError: __spec__
}}}


The fix is really simple: in {{{django/utils/autoreload.py}}}, line 114, put {{{or not hasattr(module, '__spec__')}}} before {{{or module.__spec__ is None:}}}"	Bug	closed	Core (Management commands)	2.2	Release blocker	fixed		Florian Moussous	Accepted	1	0	0	0	1	0