find min max and index

import random
def findMinMax(m, f):
    d = [(f(a),a.index(f(a))) for a in m]
    mymin = f(d, key = lambda k: k[0])
    return (d.index(mymin)+1, mymin[1]+1, mymin[0])
m = [[random.randint(-20,20) for i in range(4)] for j in range(4)]
print(m)
d = [(min(a), a.index(min(a))) for a in m]
mymin = findMinMax(m,min)
mymax = findMinMax(m,max)
print("Минимальный элемент (ряд %d,колонка %d) = %d"%mymin)
print("Максимальный элемент (ряд %d,колонка %d) = %d"%mymax)