python 隨機庫——random
import random
random.choice(['a', 'b', 'c']) -> 'a' or 'b' or 'c'
random.sample(['a', 'b', 'c'], 1) -> ['a'] or ['b'] or ['c']
random.randint(1, 3) -> 1 or 2 or 3
random.random() -> 0.015709333050641705 between 0-1
random.randrange(0, n) === random.randint(0, n-1)