如何在Python中的if語句中調用某個函數？

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我相對較新的python，在我的基礎一年，我學到了BBC BASIC，這很基礎，我在那裏得到了很多壞習慣。我在codecademy的幫助下學習了python，但是，如何在if語句中調用函數？在我的第一條if語句中，我調用了函數mainMenu(menu)，但是它沒有顯示函數內容。爲什麼？如何在Python中的if語句中調用某個函數？

（通過我只是試圖做一個ATM機只是練習一些我學到的東西，並鞏固其

print "Hello ! Welcome to JD's bank" 
print 
print "Insert bank card and press any key to procede" 
print 
raw_input() 

passcode = 1111 

attempts = 0 

while passcode == 1111: 

    passcodeInsertion= raw_input("Please insert your 4-digit code: ") 
    print"" 


    if passcodeInsertion == str(passcode): 
     print "This is working" #testing----- 
     print "" 
     mainMenu(menu) 


    elif attempts < 2: 

     print "Sorry ! Wrong passcode" 
     attempts += 1 

     print "------------------------------------------------" 
     print "" 
     print"Try again !! This is your " + str(attempts) + " attempt" 
     print 
     print "------------------------------------------------" 
     print 

    else: 
     print"" 
     print "Your card is unfortunately now blocked" 
     exit() 

def mainMenu(menu): 

    print "------------------------------------------------" 
    print "Select one of this options" 
    print "1. Check Balance" 
    print "2. Withdraw Money" 
    print "3. Deposit Money " 
    print "0. Exit " 
    print "------------------------------------------------"

來源

2016-07-25 Joselson Dias

'mainMenu（menu）'那麼，你沒有在任何地方定義菜單，所以這將會崩潰。除此之外，不應該有任何問題。 –

@MorganThrapp他必須將功能移到頂部，否則它不會被檢測到。 –

嘗試把MainMenu功能排在首位。這是這樣，因爲在Python ，函數定義必須是其使用之前。而且，你永遠不定義menu，這樣我們就可以擺脫它。

def mainMenu(): 
    print "------------------------------------------------" 
    print "Select one of this options" 
    print "1. Check Balance" 
    print "2. Withdraw Money" 
    print "3. Deposit Money " 
    print "0. Exit " 
    print "------------------------------------------------" 

print "Hello ! Welcome to JD's bank" 
print 
print "Insert bank card and press any key to procede" 
print 
raw_input() 

passcode = 1111 

attempts = 0 

while passcode == 1111: 

    passcodeInsertion= raw_input("Please insert your 4-digit code: ") 
    print"" 


    if passcodeInsertion == str(passcode): 
     print "This is working" #testing----- 
     print "" 
     mainMenu() 


    elif attempts < 2: 

     print "Sorry ! Wrong passcode" 
     attempts += 1 

     print "------------------------------------------------" 
     print "" 
     print"Try again !! This is your " + str(attempts) + " attempt" 
     print 
     print "------------------------------------------------" 
     print 

    else: 
     print"" 
     print "Your card is unfortunately now blocked" 
     exit()

來源

2016-07-25 20:00:56 geek1011

@AdamSmith修正 – geek1011

由於在C++中，該功能必須在使用它的代碼區之前定義因此，你的代碼應該是存在的d：

def mainMenu(): 

    print "------------------------------------------------" 
    print "Select one of this options" 
    print "1. Check Balance" 
    print "2. Withdraw Money" 
    print "3. Deposit Money " 
    print "0. Exit " 
    print "------------------------------------------------" 

print "Hello ! Welcome to JD's bank" 
print 
print "Insert bank card and press ENTER to proceed" 
print 
raw_input() 

passcode = 1111 
attempts = 0 

while passcode == 1111: 
     passcodeInsertion= raw_input("Please insert your 4-digit code: ") 
    print 
    if passcodeInsertion == str(passcode): 
     print "This is working" #testing----- 
     print "" 
     mainMenu() #removed menu as you have not defined it above 
    elif attempts < 2: 
     print "Sorry ! Wrong passcode" 
     attempts += 1 

     print "------------------------------------------------" 
     print "" 
     print"Try again !! This is your " + str(attempts) + " attempt" 
     print 
     print "------------------------------------------------" 
     print 
    else: 
     print"" 
     print "Your card is unfortunately now blocked" 
     exit()

還有其他地方可以放置如右圖while循環以上的功能，但要確保你的功能就是它被稱爲區域上方。

來源

2016-07-25 20:01:34

正如MorganThrapp在評論中指出的那樣，由於沒有定義'menu'，所以這會由於NameError而崩潰。 –

是的，但我認爲那只是他忘了複製的代碼... –

print "Hello ! Welcome to JD's bank" 
print 
print "Insert bank card and press any key to procede" 
print 
raw_input() 

def mainMenu(): 

    print "------------------------------------------------" 
    print "Select one of this options" 
    print "1. Check Balance" 
    print "2. Withdraw Money" 
    print "3. Deposit Money " 
    print "0. Exit " 
    print "------------------------------------------------" 

passcode = 1111 

attempts = 0 

while passcode == 1111: 

    passcodeInsertion= raw_input("Please insert your 4-digit code: ") 
    print"" 


    if passcodeInsertion == str(passcode): 
     print "This is working" #testing----- 
     print "" 
     mainMenu() 


    elif attempts < 2: 

     print "Sorry ! Wrong passcode" 
     attempts += 1 

     print "------------------------------------------------" 
     print "" 
     print"Try again !! This is your " + str(attempts) + " attempt" 
     print 
     print "------------------------------------------------" 
     print 

    else: 
     print"" 
     print "Your card is unfortunately now blocked" 
     exit()

嘗試以上操作。將mainMenu移到頂端，不需要任何參數。

來源

2016-07-25 20:02:36

謝謝！每天學習。 –

如何在Python中的if語句中調用某個函數？

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