cannot run mange.py runserver after updating to Django 2.2.4 and python 3.7 (toml.py)

Question

When running python manage.py runserver --settings=project.settings_dev I get:

Traceback (most recent call last):
  File "manage.py", line 10, in 
    execute_from_command_line(sys.argv)
  File "/usr/local/lib/python3.7/site-packages/django/core/management/__init__.py", line 381, in execute_from_command_line
    utility.execute()
  File "/usr/local/lib/python3.7/site-packages/django/core/management/__init__.py", line 375, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/usr/local/lib/python3.7/site-packages/django/core/management/base.py", line 323, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/usr/local/lib/python3.7/site-packages/django/core/management/commands/runserver.py", line 60, in execute
    super().execute(*args, **options)
  File "/usr/local/lib/python3.7/site-packages/django/core/management/base.py", line 364, in execute
    output = self.handle(*args, **options)
  File "/usr/local/lib/python3.7/site-packages/django/core/management/commands/runserver.py", line 95, in handle
    self.run(**options)
  File "/usr/local/lib/python3.7/site-packages/django/core/management/commands/runserver.py", line 102, in run
    autoreload.run_with_reloader(self.inner_run, **options)
  File "/usr/local/lib/python3.7/site-packages/django/utils/autoreload.py", line 600, in run_with_reloader
    start_django(reloader, main_func, *args, **kwargs)
  File "/usr/local/lib/python3.7/site-packages/django/utils/autoreload.py", line 585, in start_django
    reloader.run(django_main_thread)
  File "/usr/local/lib/python3.7/site-packages/django/utils/autoreload.py", line 303, in run
    self.run_loop()
  File "/usr/local/lib/python3.7/site-packages/django/utils/autoreload.py", line 309, in run_loop
    next(ticker)
  File "/usr/local/lib/python3.7/site-packages/django/utils/autoreload.py", line 349, in tick
    for filepath, mtime in self.snapshot_files():
  File "/usr/local/lib/python3.7/site-packages/django/utils/autoreload.py", line 365, in snapshot_files
    for file in self.watched_files():
  File "/usr/local/lib/python3.7/site-packages/django/utils/autoreload.py", line 264, in watched_files
    yield from iter_all_python_module_files()
  File "/usr/local/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 "/usr/local/lib/python3.7/site-packages/django/utils/autoreload.py", line 131, in iter_modules_and_files
    if spec.has_location:
AttributeError: 'str' object has no attribute 'has_location'

This is the function that errors: https://github.com/django/django/blob/master/django/utils/autoreload.py#L131

@functools.lru_cache(maxsize=1)
def iter_modules_and_files(modules, extra_files):
    """Iterate through all modules needed to be watched."""
    sys_file_paths = []
    for module in modules:
        # During debugging (with PyDev) the 'typing.io' and 'typing.re' objects
        # are added to sys.modules, however they are types not modules and so
        # cause issues here.
        if not isinstance(module, ModuleType):
            continue
        if module.__name__ == '__main__':
            # __main__ (usually manage.py) doesn't always have a __spec__ set.
            # Handle this by falling back to using __file__, resolved below.
            # See https://docs.python.org/reference/import.html#main-spec
            # __file__ may not exists, e.g. when running ipdb debugger.
            if hasattr(module, '__file__'):
                sys_file_paths.append(module.__file__)
            continue
        if getattr(module, '__spec__', None) is None:
            continue
        spec = module.__spec__
        # Modules could be loaded from places without a concrete location. If
        # this is the case, skip them.
        if type(spec) is str:
            import ipdb; ipdb.set_trace()
        if spec.has_location:
            origin = spec.loader.archive if isinstance(spec.loader, zipimporter) else spec.origin
            sys_file_paths.append(origin)

    results = set()
    for filename in itertools.chain(sys_file_paths, extra_files):
        if not filename:
            continue
        path = pathlib.Path(filename)
        try:
            if not path.exists():
                # The module could have been removed, don't fail loudly if this
                # is the case.
                continue
            results.add(path.resolve().absolute())
        except ValueError as e:
            # Network filesystems may return null bytes in file paths.
            logger.debug('"%s" raised when resolving path: "%s"' % (str(e), path))
    return frozenset(results)

After placing an ipdb debugger in django/utils/autoreload.py:131 the f if

type(spec) is str:
            import ipdb; ipdb.set_trace()

and printing out __module__.__name__ and __module__.__file__ I get:

ipdb> module.__name__                                                                                                                                                                                                                                                           
'toml'
ipdb> module.__file__                                                                                                                                                                                                                                                           
'/usr/local/lib/python3.7/site-packages/toml.py'
ipdb>

Does anyone know what is the issue?

By replacing line :131 of django/utils/autoreload.py to

if type(spec) is not str and spec.has_location:

Dev server is somehow running...

Oleg Belousov · Accepted Answer

pip install toml==0.10.0

Updating toml to the latest version from PyPi worked https://pypi.org/project/toml/

cannot run mange.py runserver after updating to Django 2.2.4 and python 3.7 (toml.py)

Answers (2)

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