UnboundLocalError：分配前引用的局部变量“密码”

Question

def start():

    global smallq
    global medq
    global larq
    check = input("Would you like to change prices? Press Y to change or Press N to  continue to order: ")

    if check == "Y":
        password = input("What is the password?: ")
    else:
        print("Continuing to order...")
        smallq = 50
        medq = 120
        larq = 180
        order()

    if password == "please":
        quilt_price()
    else:
        print("Wrong password", "\n", "Continuing to order...")
        smallq = 50
        medq = 120
        larq = 180
        order()

例外：

Traceback (most recent call last):
  File "/Users/palerj09/Documents/SAC RW.py", line 128, in <module>
    start()
  File "/Users/palerj09/Documents/SAC RW.py", line 18, in start
    if password == "please":
UnboundLocalError: local variable 'password' referenced before assignment

如果我写“N”来回答输入它会运行order() 并且一切正常，除非order() 完成它会引发错误。我尝试将password 设为全局，但这似乎不起作用。有什么想法吗？

Answer 1

如果输入不是"Y"怎么办？那么password 将永远不会被创建，因此if password == "please" 会引发错误。也许在你的条件语句之前做password = None。