python如何取余和取商？

a = 21

b = 10

c = 0

c = a / b

print("4 - c 的值为：", c )

c = a % b

print("5 - c 的值为：", c)

>>>divmod(7, 2)

(3, 1)

>>> divmod(8, 2)

(4, 0)

>>> divmod(1+2j,1+0.5j)

((1+0j), 1.5j)