Python 官方文档:入门教程 => 点击学习
#############################userername = raw_input("USERNAME:")passWord = raw_input("PASSWORD:")if username == "user" a
#################
############
userername = raw_input("USERNAME:")
passWord = raw_input("PASSWORD:")
if username == "user" and password == "123":
print "welcome"
break
elif username != "user" and password != "123":
print "username and password mistakes"
elife username == "user" and password != "123":
print "password mistakes"
elife username != "user" and password == "123":
print "username mistakes"
--结束END--
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