django.utils.functional.lazy cannot be used with regular expressions module (re)

[Daniel Hahler]

from django.utils.functional import lazy
import re

f = lazy(lambda: 's', str)()
re.match('s', f)

results in TypeError: expected string or bytes-like object.

This gets generated in ​https://github.com/python/cpython/blob/e02afa7a78f1515dd7386912812685fb4d519a44/Modules/_sre.c#L338-L342, where the PyObject_GetBuffer call appears to fail.

[Claude Paroz]

In general, lazy stuff in Django is safe for Django's own code, but not for any Python code. It's explained for example in ​https://docs.djangoproject.com/en/stable/topics/i18n/translation/#working-with-lazy-translation-objects

If you think a fix is possible for this, why not, but I think you are not the first to try and I'm not sure it's possible.

[Tim Graham]

Please reopen if anyone has an idea about an implementation or can provide a patch.