How to check type of reverse_lazy() object in django

Question

I want to do following:

u=reverse_lazy('xyz')
isinstance(u,str) # this is false since u is an object.

type(u) # <class 'django.utils.functional.lazy.<locals>.__proxy__'>

isinstance(u,<class 'django.utils.functional.lazy.<locals>.__proxy__'>) # doesnt work