方法一：

#coding: utf-8

import random

import string

checkcode = ”

for i in range(4):

current = random.randrange(0,6)

if current != i:

temp = chr(random.randint(65,90))

else:

temp = random.randint(0,9)

checkcode += str(temp)

print checkcode

方法二

#coding: utf-8import randomimport stringzimu = string.ascii_lettersshuzi = string.digitsstr_source = zimu+ shuziprint ''.join(random.sample(str_source,4))