【python】break和continue

break:跳出循环 ，continue:停止当前循环，进入下一次循环，但为跳出循环。

passwdList=["123","456"]
valid = False
count = 3
while count > 0:
    input = raw_input("enter password: ")
    for eachPasswd in passwdList:
        if input == eachPasswd:
            valid = True
            break          #跳出for循环，继续while循环
    if not valid: # (or valid == 0)
        print "invalid input"
        count -= 1
        continue  #进入下一次while循环
    else:
        break  #跳出while循环