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
36712	Deferred type annotations on template tags lead to TypeError with Python 3.14	Patrick Rauscher	Jacob Walls	"Similar to #36696 (which covered mainly Signals) this covers templatetags, where issues may happen when using SafeText:

{{{
from typing import TYPE_CHECKING

from django import template
from django.utils.html import escape

if TYPE_CHECKING:
    from django.utils.safestring import SafeText


register = template.Library()

@register.filter(""example"")
def example_filter(value: str) -> SafeText:
    return escape(value)
}}}

When using the templatetag, `django/template/base.py` line 763 (in django 5.2.8) will call `inspect.getfullargspec` for the filter, leading to a NameError which gets translated by inspect to a `TypeError: unsupported callable`. After searching a bit through the code this may also happen with views, as several parts of django use inspect directly for different checks (e.g. for templatetags it is used to check the number of arguments).

Not sure if this is a bug in python or django yet. One solution in django would be to replace direct calls to `inspect.signature` or `inspect.getfullargspec` (which uses `inspect.signature` internally according to python docs, but does not allow to specify an `annotation_format`."	Bug	closed	Template system	5.2	Release blocker	fixed	typing, inspect, deferred annotations	Patrick Rauscher	Ready for checkin	1	0	0	0	0	0