Guess number AI in Python

#!/usr/bin/python3
import itertools 
import operator

def ab(x,y):
    a=sum(map(operator.eq,x,y))
    b=len(set(x).intersection(y))-a
    return (a,b)

q=list(itertools.permutations(range(10), 4))

while q:
    f = q.pop(0)
    (a,b)=tuple(map(int, input(f).split(' ')))
    q=list(filter(lambda x: ab(x, f)==(a,b), q))