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
29306	[bugs for all version]Template variable-lookups system evaluate callables before completed the evaluation	Luoxzhg	nobody	"{{{
class A:
    class B:
         attr=""Hello""

from django.template import Template, Context
t = Template("" {{  A.B.attr }}"")
output=t.render(Context({""A"": A}))
}}}

the output should be ""Hello"", but it is string_if_invalid, i.e., empty string """" ."	Bug	new	Template system	dev	Normal		template		Unreviewed	1	0	0	0	1	0