Python标准库系列之random模块

This module implements pseudo-random number generators for various distributions.

random.random()

生成0-1的小数

>>> random.random()
0.06511225392331632
>>> random.random()
0.9063480964287944
>>> random.random()
0.1255900898753961
>>> random.random()
0.6676866041289258

random.randint(a, b)

输出a和b范围内的数,包括a和b

>>> random.randint(1,2)
1
>>> random.randint(1,2)
1
>>> random.randint(1,2)
1
>>> random.randint(1,2)
2
>>> random.randint(1,2)
1
>>> random.randint(1,2)
1

random.randrange(start, stop[, step])

输出start到stop-1之间的数,可设置步长

>>> random.randrange(1,3)
2
>>> random.randrange(1,3)
1
>>> random.randrange(1,3)
2

随机验证码实例

#!/usr/bin/env python
import random
checkcode = ''
# for循环四次
for i in range(4):
# current=0-3的数字
current = random.randrange(0,4)
# 如果current的值不等于i
if current != i:
# 通过chr把数字转换为一个字母赋值给temp
temp = chr(random.randint(65,90))
else:
# 否则temp=0-9之间的数字
temp = random.randint(0,9)
# checkcode = checkcode + str(temp)
checkcode += str(temp)
# 输出字符
print(checkcode)

执行

ansheng@ansheng-me:~$ python s.py
TCQ1
ansheng@ansheng-me:~$ python s.py
8L01
ansheng@ansheng-me:~$ python s.py
N2EB
ansheng@ansheng-me:~$ python s.py
XIDO

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