random模块

一,

例子:
import random
print(random.random())
print(random.randint(1,3))
print(random.randrange(1,3))
print(random.choice([11,22,33,‘we’]))
print(random.sample([11,22,33,44,55],2))
print(random.uniform(2,9))

shuffle.>>打乱顺序
a=[1,2,3,4,5]
random.shuffle(a)
print(a)

二,编写一个验证码包含数字和字母
chr是ASCII表的转化