python练习题

#################

############

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"

python练习题

原文：http://ybzbfs.blog.51cto.com/12765816/1943242