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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"
本文转自铁骑传说51CTO博客，原文链接： http://blog.51cto.com/ybzbfs/1943242，如需转载请自行联系原作者