算个小算法吧
前提是：保证平等。
some_list =（a,b,c） probabilities是 = （0.2，0.3，0.5）
打印让some_list某个元素的概率一一映射
https://www.cnblogs.com/shenxiaolin/p/7810048.html
import random
def random_pick(some_list, probabilities):
x = random.uniform(0,1)
cumulative_probability = 0.0
for item, item_probability in zip(some_list, probabilities):
cumulative_probability += item_probability
if x < cumulative_probability:
break
return item