python 生成简单验证码

#!/usr/bin/env python
# --*-- encoding:utf-8 --*--
import random

def get_verify_code():
    "65-90,97-122,0-9"
    temp =''
    for i in range(0,4):
        i1 = random.randint(0,2)
        if i1 == 0:
            i2 = random.randint(65,90)
            temp = temp + chr(i2)
        elif i1 == 1:
            i2 = random.randint(97,122)
            temp = temp + chr(i2)
        else:
            i2 = random.randint(0,9)
            temp = temp + str(i2)
    return temp

if __name__ == '__main__':
    print(get_verify_code())