python中的多个循环

for i in range(3):
    for j in range(2):
        print(i, j)

0 0
0 1
1 0
1 1
2 0
2 1

fruits = ['apple', 'banana', 'cherry']
colors = ['red', 'yellow', 'purple']

for fruit, color in zip(fruits, colors):
    print(fruit, color)

apple red
banana yellow
cherry purple

numbers = [1, 2, 3]
squares = [x**2 for x in numbers]
cubes = [x**3 for x in numbers]

print(squares)  # 输出 [1, 4, 9]
print(cubes)    # 输出 [1, 8, 27]

import itertools

colors = ['red', 'yellow', 'purple']
sizes = ['small', 'medium', 'large']

for color, size in itertools.product(colors, sizes):
    print(color, size)

red small
red medium
red large
yellow small
yellow medium
yellow large
purple small
purple medium
purple large