Question

我想从函数the_word更改set_word。如何替换旧的the_word，以便在菜单的下一次迭代中使用新单词？

def main():
    print("Welcome to the encrypt script")
    the_word = input("Enter the word you want to encrypt\n>>>")
    while True:
        #print("START")
        menu(the_word)

def menu(the_word):
    print("\n\n=============MENU=============")
    actions = {
    '1': ("Encrypt into templar's code", templar),
    '2': ("Encrypt with caesar's code", caesar),
    '3': ("Change the word", set_word),
    '4': ("Exit", stop)
    }

    for i in sorted(actions):
        print('{}. {}'.format(i, actions[i][0]))

    entry = input('Option: ')
    if entry in actions:
        try:
            actions[entry][1]()
        except:
            actions[entry][1](the_word)
    else:
        print("No such command") 

def templar(the_word):
    print("TEMPLAR",the_word) 

def caesar(the_word):
    print("CAESAR",the_word) 

def set_word():
    the_word = input("Enter the word you want to encrypt\n>>>")

def stop():
    print("Thanks for using the encrypt script")
    quit()

main()

Answer 1

如果您希望在程序中共享变量，则应将其声明为全局变量。

在这种情况下，the_word变量应声明为全局。

在更改全局变量值的每个函数中，您应该在更改之前通过写入来声明它：global the_word

如果您只阅读变量，则不必声明global the_word

因此您的代码可以更改为：

# declare the_word as global
the_word = ""


def main():
    global the_word
    print("Welcome to the encrypt script")
    the_word = input("Enter the word you want to encrypt\n>>>")
    while True:
        # print("START")
        menu()


def menu():
    global the_word
    print("\n\n=============MENU=============")
    actions = {
        '1': ("Encrypt into templar's code", templar),
        '2': ("Encrypt with caesar's code", caesar),
        '3': ("Change the word", set_word),
        '4': ("Exit", stop)
    }

    for i in sorted(actions):
        print('{}. {}'.format(i, actions[i][0]))

    entry = input('Option: ')
    if entry in actions:
        try:
            actions[entry][1]()
        except:
            actions[entry][1]()
    else:
        print("No such command")


def templar():
    print("TEMPLAR", the_word)


def caesar():
    print("CAESAR", the_word)


def set_word():
    global the_word
    the_word = input("Enter the word you want to encrypt\n>>>")


def stop():
    print("Thanks for using the encrypt script")
    quit()


main()

库中的变量内部函数

1 个答案: