python:random用法

python:random用法

import random
print(random.random()) #生成0-1的随机数
print(random.randint(1,7)) #生成1-7的随机数,包含1和7
print(random.randrange(1,100,4)) #生成1-100,以4为基数的随机数,如:1,4,8,12,16....等
random.choice("hello world") #从字符串序列中随机生成一个字母,如:h,w,r,l,e等
random.choice(['hello','world','hi','you','java'])
print(random.sample([1,3,5,7,9,12],3)) #从序列中随机取3个数,即[1,5,7]
print(random.sample('hello world',3))

#洗牌

items=[1,2,3,4,5,6,7]
print(items)
[1,2,3,4,5,6,7]
random.shuffle(items)
print(items)
[2,5,7,4,6,3,1]

#生成5位随机验证码

import random
checkcode=''
for i in range(5):
............current=random.randrange(0,9)
............if current==i:
...............temp=chr(random.randint(65,90))
............else:
...............temp=random,randint(0,9)
............checkcode+=str(temp)
........print(checkcode)