生成随机验证码

#coding=utf-8

方法一
import random

checkcode=''
for i in range(4):     #0,1,2,3
    current=random.randrange(0,4)
    if current !=i:
        temp=chr(random.randint(65,90))    #65以上是字母,chr()把整数作为参数，返回一个对应的字符
    else:
        temp=random.randint(0,9)
    checkcode +=str(temp)
print checkcode



方法二
import random

checkcode=[]
for i in range(4):
    if i==random.randint(1,3):
        checkcode.append(str(i))
    else:
        temp=chr(random.randint(65,90))
        checkcode.append(str(temp))
print checkcode
print ''.join(checkcode)