代码如下：
#!/usr/bin/env python
# _*_ coding:utf-8 _*_
__author__ = 'junxi'
import random
checkcode = ''
for i in range(4):
current = random.randrange(0,4)
if current != i:
temp = chr(random.randint(65,90)) # chr返回整数对应的ascll字符
print temp
else:
temp = random.randint(0,9)
checkcode += str(temp)
print(checkcode)
运行：
02V1
