python - In Django templates, `Context` is a stack. What for? -

django docs say context object stack:

from django.template import context c = context() c['a'] = 1 c.push() # make new context level c['a'] = 2 print(repr(c)) # [{'a': 1}, {'a': 2}] 

also docs say

using context stack comes in handy in custom template tags

however, there's no example that. suggestion: it's useful render subtemplate clean context ; 1 can use new empty context() object instead.

so, what's use case?

the use case scoping, example in loops , template inheritance.