нестроковой Top Козыри карточной игры ошибка

Question

import random 
from random import shuffle 
import time 

game = True 
while game: 

    class X(object): # creates an object based class named X 
     def __init__(self, name, rating, power, defence, XRay, toughness): #defines the structures of the class so they can be later displayed 
      self.name = name 
      self.rating = rating 
      self.power = power 
      self.defence = defence    
      self.XRay = XRay 
      self.toughness = toughness 

     def __repr__(self): 
      print("\nName : ", self.name, "\nRating : ", self.rating, "\nPower : ", self.power, "\nDefence : ", self.defence, "\nXRay : ", self.XRay, "\nToughness : ", self.toughness) #Telling the code that whenever it calles out the X class to print the atributes of the Card 

    q = X("Inferno Scorpion", 3, 970, 940, 2010, 1090) 
    w = X("Grandmaster Sub-Zero", 3, 900, 1000, 1900, 1000) 
    e = X("Kenshi", 3, 910, 930, 1840, 950) 
    r = X("Master Of Souls Ermac", 3, 940, 850, 1790, 950) 
    t = X("Sun God Kotal Kahn", 3, 930, 950, 1040, 890) 
    y = X("Jax Briggs", 2, 500, 520, 1020, 800) 
    u = X("Cassie Cage", 2, 520, 380, 900, 400) 
    i = X("Sonya Blade", 2, 460, 370, 830, 380) 
    i2 = X("Tactical Sonya Blade", 3, 930, 840, 1770, 930) 
    o = X("D'vorah", 2, 460, 390, 850, 370) 
    p = X("Kung Jin", 2, 410, 360, 770, 330) 
    p2 = X("Bojutsu Kung Jin", 3, 860, 880, 1740, 930) 
    a = X("Sergent", 1, 210, 230, 440, 230) 
    s = X("Oni", 1, 250, 260, 510, 200) 
    d = X("Monk", 1, 230, 210, 440, 200) 
    f = X("Osh-Tekk", 1, 220, 220, 440, 200) 
    g = X("Trooper", 1, 200, 200, 400, 210) 
    j = X("Kano", 2, 400, 380, 780, 420) 
    k = X("Shirai Ryu", 1, 220, 180, 400, 200) 
    l = X("Reptile", 3, 780, 760, 1540, 890) 
    z = X("Johnny Cage", 2, 390, 420, 810, 360) 
    x = X("Lin Kuei", 1, 180, 220, 400, 200) 
    c = X("Saurian", 1, 210, 190, 400, 200) # the playing cards 


    allCards = [q, w, e, r, t, y, u, i, o, p, a, s, d, f, g, j, k, l, z, x, c] 

    shuffle (allCards) 

    print ("Your deck is being dealt... please wait") 
    time.sleep(1) 
    print ("...") 
    time.sleep(1) 


    half = int(len(allCards)/2) 
    p1 = (allCards[0:half]) 
    cpu = (allCards[half:]) 

    print ("\nPlayer one has",len(p1), "cards... let's do this!") 

    def error(): 
     global p1 
     global cpu   
     chosenability() 

    def chosenability(): 
     global p1 
     global cpu 

     pick=input("\nMake your selection: \n") 
     user_choice=pick.lower() 

     if user_choice=="Rating": 
      p1_choice=p1[0].rating 
      cpu_choice=cpu[0].rating 
      print ("\nRating = ", p1_choice) 
     elif user_choice=="Power": 
      p1_choice=p1[0].power 
      cpu_choice=cpu[0].power 
      print ("\nPower = ", p1_choice) 
     elif user_choice=="Defence": 
      p1_choice=p1[0].defence 
      cpu_choice=cpu[0].defence 
      print ("\nDefence = ", p1_choice) 
     elif user_choice=="XRay": 
      p1_choice=p1[0].XRay 
      cpu_choice=cpu[0].XRay 
      print ("\nXRay = ", p1_choice) 
     else: 
      print ("\nInvalid selection") 
      error() 

     if p1_choice>cpu_choice: 
      time.sleep(2) 
      print ("Computers card is...",(cpu[0])) 
      time.sleep(2)    
      print ("\nYou win card", cpu[0].name) 
      p1.append(cpu[0]) 
      del cpu[0] 
      p1=p1+[p1.pop(0)] 
      print ("You now have", len(p1),"cards") 
      print ("CPU now has", len(cpu),"cards") 

     elif p1_choice<cpu_choice:     
      time.sleep(2) 
      print ("Computers card is...",(cpu[0])) 
      time.sleep(2) 
      print ("\nYou Lose your card", p1[0].name) 
      cpu.append(p1[0]) 
      del p1[0] 
      cpu=cpu+[cpu.pop(0)] 
      print ("CPU now has", len(cpu),"cards") 
      print ("You now have", len(p1),"cards") 

     else:     
      time.sleep(2) 
      print ("Computers card is...",(cpu[0])) 
      time.sleep(2) 
      print ("\nDraw") 
      cpu=cpu+[cpu.pop(0)] 
      p1=p1+[p1.pop(0)] 


    while len(p1)>0 and len(cpu)>0: 

     time.sleep(0.5) 
     print ("\nYour card is \n", (p1[0])) 
     time.sleep(1.5) 

     chosenability() 


    print ("Play again ?") 
    play_again = input ("Type yes, or no: ") 
    if play_again == "Yes" or play_again == "YES" or play_again == "yes": 
     game = True 

Выход

Your deck is being dealt... please wait 
... 

Player one has 10 cards... let's do this! 

Your card is 

Name : Cassie Cage 
Rating : 2 
Power : 520 
Defence : 380 
XRay : 900 
Toughness : 400 
Traceback (most recent call last): 
    File "H:\GCSE Computer Sciance\Practicle\XMain.py", line 127, in <module> 
builtins.TypeError: __str__ returned non-string (type NoneType) 

Когда я запускаю код он возвращает эту ошибку, может кто-то помочь мне исправить это?

Answer 1

Вашего метод __repr__ должен возвращать объект строки, но вы ничего не возвращаете:

def __repr__(self): 
     print("\nName : ", self.name, "\nRating : ", self.rating, "\nPower : ", self.power, "\nDefence : ", self.defence, "\nXRay : ", self.XRay, "\nToughness : ", self.toughness) 

При использовании print ("\nYour card is \n", (p1[0]))p1[0] карты преобразуются в строку print(), что означает, что p1[0].__str__() называется; поскольку вы не определили этот метод, Python затем возвращается к p1[0].__repr__(), который возвратил None и привел к ошибке.

Не используйте print() здесь, используйте return:

def __repr__(self): 
     return "\nName : {}\nRating : {}\nPower : {}\nDefence : {}\nXRay : {}\nToughness : {}".format(
      self.name, self.rating, self.power, self.defence, self.XRay, self.toughness) 

Answer 2

Это трудно сказать, не работает код, но это может быть, что вы никогда не возвращать строку для метода __repr__, а просто распечатать его ,

Вернуть то, что вы печатаете, и вместо этого вызывать печать на строке.