Return response during multi if in python

I'm doing a unit testing, I'm checking fields in two databases collections so during it I have to do a multi if conditions like this:

for doc1,doc2 in itertools.izip(docs1, docs2):
    if ... :
        if ... :
            response = 'Error'
        else:
            response = 'OK'
    else... :
        if ... :
            response = 'Error'
        else:
            response = 'OK'
    if ... :
        if ... :
            response = 'Error'
        else ... :
            response = 'OK'
    else ... :
        if ... :
            response = 'Error'
        else ... :
            response = 'OK'

so I want to assert a response if the error happened in one of this ifs, to give an answer like this: self.assert400(response, message="Bad request, empty body.")

and when the whole process is okay to give an Ok response.

So what to achieve this?

I thought to create an if condition in the end of it but that wouldn't stop the for loop?Please help me?