代码如下：
#!/usr/bin/env python
# coding:utf-8
id=0
while 1:
user=raw_input(“user:”)
password=raw_input(“password:”)
if user == “user” and password == “123”:
print “welcome to user manage system”
exit(0)
else:
if id <3:
print “请重新输入”
id=id+1
elif id==3:
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