[Py3.11] RuntimeError: dictionary changed size during iteration

[AdityaGupta030697]

Hi team,

I'm getting this error intermittently:

Traceback (most recent call last):
  File <SNIP>
    with freezegun.freeze_time(lambda: datetime(today.year,
  File " <SNIP>/python3.11/site-packages/freezegun/api.py", line 633, in __enter__
    return self.start()
           ^^^^^^^^^^^^
  File "<SNIP>/python3.11/site-packages/freezegun/api.py", line 714, in start
    for mod_name, module in list(sys.modules.items()):
                            ^^^^^^^^^^^^^^^^^^^^^^^^^
RuntimeError: dictionary changed size during iteration

Unfortunately, I don't have a reproducer yet. Would something like this work here?

mod_names = list(sys.modules.keys())
for mod_name in mod_names:
    module =  sys.modules[mod_name]

    if mod_name is None or module is None or mod_name == __name__:
        continue
    elif mod_name.startswith(self.ignore) or mod_name.endswith('.six.moves'):
        continue
    elif (not hasattr(module, "__name__") or module.__name__ in ('datetime', 'time')):
        continue

    module_attrs = _get_cached_module_attributes(module)
    for attribute_name, attribute_value in module_attrs:
        fake = fakes.get(id(attribute_value))
        if fake:
            setattr(module, attribute_name, fake)
            add_change((module, attribute_name, attribute_value))

Please let me know if I'm missing something.

[jokatzke]

This also happens to me sometimes. Running on Python 3.12.11 with Freezegun version 1.5.1. Unfortunately, I've also been unable to replicate the issue.