Unit-testing Python: Mocking function calls inside function

I have a django view like this

# Django view

from some_module import f2
def f1(request, version):
    # some code

    f2(**kargs)

    # more code
    return HTTPResponse(response)

The function f2 is in another module

# some_module
def f2(**kargs):
    # some code

The Django view is part of an API so, the request and response are in json

How do I :

1. write a unit test for this function while mocking the request
2. mock f2, which is a database based function and avoid database connections entirely