Python Phone Class ---打印無

class Phone: 
    def __init__(self): 
     self.types = ["Touch Screen","Flip", "Slider", "Bar", "Bag"] 
     self.brand = "No Brand Determined" 
     self.type_of_phone = "No Type of Phone has been selected" 

    def get_type(self): 
     return self.type_of_phone 
    def change_type(self, changeTo): 
     if self.check_type(changeTo): 
      self.type_of_phone = changeTo 
     else: 
      print("The Type you wish to change the phone to is not a supported type.") 

    def change_brand(self, changeTo): 
     self.brand = changeTo 


    def check_type(self, inQuestion): 
     if inQuestion in self.types: 
      return True 
     return False 
    def toString(self): 
     return "Brand: "+self.brand+"\nType: "+self.type_of_phone+"\n" 

    def menu(self): 
     self.intro() 
     while True: 
      self.mainScreen() 

    def intro(self): 
     print("This program will let you create a cell phone type and brand.") 

    def mainScreen(self): 
     option = input(print("(1) See your phone specs \n(2) Change information\n Enter a Number: ")) 
     if option == "1": 
      print("\n"+self.toString()) 
     elif option == "2": 
      self.changeScreen() 
     else: 
      print("Enter 1 or 2. Please.") 

    def changeScreen(self): 
      option = input(print("\nWould you like to change the...\n(1) Type\n(2) Brand\n Enter a Number: ")) 
      if option == "1": 
       self.changeMyType() 
      elif option == "2": 
       self.changeMyBrand() 
      else: 
       print("Enter 1 or 2") 
       self.changeScreen() 


    def changeMyType(self): 
     optionType = input(print("\nThese are your options of phones: \n",self.types,"\nEnter an option [case sensitive]: ")) 
     self.change_type(optionType) 

    def changeMyBrand(self): 
     optionBrand = input(print("\nEnter the Brand you would like your phone to be: ")) 
     self.change_brand(optionBrand) 



def main(): 

    #commands created that fully work: 
    #Types of Phones to change to: Touch Screen, Flip, Slider, Bar, Bag 
    #get_type() 
    #change_type() 

    myPhone = Phone() 
    myPhone.menu() 
main()

運行這個python文件。當我運行它時，每次打印後都會打印「無」。我不明白爲什麼。我知道，當你的python函數沒有返回時，它將返回None，但我不明白這裏發生了什麼。其他反饋也很棒。現在我有一個對象電話，有一個菜單和其他的東西。告訴我是否有另一種方法可以解決這個問題。Python Phone Class ---打印無

來源

2011-12-25 Jpy

舉目看到input(print("..."))，即改爲input("...")。我的猜測是，它正陷入print()函數中，並很樂意打印None。

一定要把它標記爲python3.x，因爲這絕對不是2.x的問題。

來源

2011-12-25 05:23:40 Makoto

謝謝你的工作 – Jpy 2011-12-29 07:27:34

這是因爲：

input(print("(1) See your phone specs \n(2) Change information\n Enter a Number: "))

的print（）函數沒有返回值（即無）得到由輸入（印刷），你不需要調用print（）函數，因此，應該是這樣的：

input("(1) See your phone specs \n(2) Change information\n Enter a Number: ")

來源

2011-12-25 05:17:53

Python Phone Class ---打印無

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