Extended Euclidean algorithm

def ext_euclid ( a , b ):
     if (b == 0):
         return 1, 0, a
     else:
         x , y , q = ext_euclid( b , a % b )
         x , y = y, ( x - (a // b) * y )
         return x, y, q
         
print(ext_euclid(17,3120))