Ich habe Probleme mit meinen elif Aussagen

Question

Ich programmiere ein Spiel, um zu versuchen, meine Fähigkeiten in Python zu verbessern. In diesem Teil des Codes versuche ich ein Geschäft mit einem Geldsystem Testen einer Variablen gegen 5 verschiedene mögliche Antworten zu programmieren

while True: 
       choice=str(input("What would you like to buy? (Type in 'nothing' when you don't want anymore items) ")) 
       if choice!="health potion" and "strength potion" and "strength booster" and "armour piece" and "nothing": 
        print() 
        next_line=input("I do not understand what you wrote. Try again please ") 
        print() 
       elif choice=="nothing": 
        next_line=input("The merchant says 'Thanks for business' ") 
        print() 
        break 
       elif choice=="health potion": 
        gold=gold-10 
        if gold<0: 
         gold=gold+10 
         next_line=input("Sorry but you don't have enough gold ") 
         print() 
        else: 
         next_line=input("You bought a health potion ") 
         health_potions=health_potions+1 
         next_line=input("You now have "+str(gold)+" gold coins ") 
         print() 
       elif choice=="strength potion": 
        gold=gold-15 
        if gold<0: 
         gold=gold+15 
         next_line=input("Sorry but you don't have enough gold ") 
         print() 
        else: 
         next_line=input("You bought a strength potion ") 
         strength_potions=strength_potions+1 
         next_line=input("You now have "+str(gold)+" gold coins ") 
         print() 
       elif choice=="strength booster": 
        gold=gold-45 
        if gold<0: 
         gold=gold+45 
         next_line=input("Sorry but you don't have enough gold ") 
         print() 
        else: 
         next_line=input("You boosted your strength ") 
         strength_booster=strength_booster+1 
         next_line=input("You now have "+str(gold)+" gold coins ") 
         print() 
       elif choice=="armour piece": 
        gold=gold-30 
        if gold<0: 
         gold=gold+30 
         next_line=input("Sorry but you don't have enough gold ") 
         print() 
        else: 
         next_line=input("You bought an armour piece ") 
         armour=armour+1 
         next_line=input("You now have "+str(gold)+" gold coins ") 
         print() 

Bei der Eingabe health potion der Code auf wie normalen geht aber mit den anderen Eingängen geht es zu dieser Teil des Codes

if choice!="health potion" and "strength potion" and "strength booster" and "armour piece" and "nothing": 
       print() 
       next_line=input("I do not understand what you wrote. Try again please ") 
       print() 

Answer 1

Ihr Problem ist mit dieser Aussage:

if choice!="health potion" and "strength potion" and "strength booster" and "armour piece" and "nothing": 

Vergleicht Strings wie dies funktioniert nicht. Sie müssen sicherstellen, dass es nicht in einem Array der Strings

if choice not in ("health potion","strength potion","strength booster","armour piece","nothing"): 

Ansonsten ist, wird es immer wahr sein, so dass die erste Anweisung wird immer ausgeführt werden.

Answer 2

Zum Spaß, hier ist eine deutlich erweiterte Version.

Mach dir keine Sorgen, wenn es nicht sofort einen Sinn ergibt; versuche, es durchzuspielen und herauszufinden, wie es funktioniert. Sobald Sie es vollständig verstanden haben, werden Sie Python besser verstehen!

class Character: 
    def __init__(self, name, health=50, strength=20, gold=200, inventory=None): 
     """ 
     Create a new character 

     inventory is a list of items (may have repeats) 
     """ 
     self.name = name 
     self.health = health 
     self.strength = strength 
     self.gold = gold 
     self.inventory = [] if inventory is None else list(inventory) 

    def buy(self, item): 
     """ 
     Buy an item 
     """ 
     if self.gold >= item.cost: 
      print(item.buy_response.format(name=item.name, cost=item.cost)) # print acceptance 
      self.gold -= item.cost            # pay gold 
      item.buy_action(self)            # apply purchased item to character 
      return True 
     else: 
      print("Sorry but you don't have enough gold.") 
      return False 

class Item: 
    def __init__(self, name, cost, buy_response="You bought a {name} for {cost} GP", buy_action=None): 
     # store values 
     self.name = name 
     self.cost = cost 
     # what to print on a successful purchase 
     self.buy_response = buy_response 
     # apply a purchased item to the character 
     self.buy_action = self.make_buy_action() if buy_action is None else buy_action 

    def make_buy_action(self): 
     def buy_action(char): 
      """ 
      Purchase default action: add item to character inventory 
      """ 
      char.inventory.append(self) 
     return buy_action 

    @staticmethod 
    def buy_strength_booster(char): 
     """ 
     Purchase strength booster action: increase character strength 
     """ 
     char.strength += 1 

    def __str__(self): 
     return self.name 

class Shop: 
    def __init__(self, name, *inventory): 
     """ 
     Create a shop 

     inventory is a list of (num, item); if num is None the store has an unlimited supply 
     """ 
     self.name = name 
     self.inventory = {item.name:(num, item) for num,item in inventory} 

    def visit(self, char): 
     """ 
     Serve a customer 
     """ 
     print("\nHowdy, {}, and welcome to {}!".format(char.name, self.name)) 

     while True: 
      print("\nWhat would you like to buy today? (type 'list' to see what's available or 'done' to leave)") 
      opt = input("{} GP> ".format(char.gold)).strip().lower() 
      if opt == 'done': 
       print("Have a great day, and c'mon back when you've got more gold!") 
       break 
      elif opt == 'list': 
       item_names = sorted(name for name, (num, item) in self.inventory.items() if num is None or num > 0) 
       if item_names: 
        print(", ".join(item_names)) 
       else: 
        print("Huh - looks like we're all sold out. Try again next week!") 
        break 
      elif opt in self.inventory: 
       num, item = self.inventory[opt] 
       if num is None or num > 0: 
        yn = input("That's {} GP. You want it? [Y/n]".format(item.cost)).strip().lower() 
        if yn in {'', 'y', 'yes'}: 
         if char.buy(item) and num is not None: 
          self.inventory[opt] = (num - 1, item) 
        else: 
         print("(scowling, the proprietor stuffs the {} back under the counter)".format(item.name)) 
       else: 
        print("'Fraid we're all out of those.") 
      else: 
       print("Sorry, hain't had one o' those around in a coon's age!") 

def main(): 
    # stock the store 
    shop = Shop("Dwarven Dave's Delving Deal Depot", 
     (6, Item("health potion", 10)), 
     (6, Item("strength potion", 15)), 
     (3, Item("strength booster", 45, "You boosted your strength!", Item.buy_strength_booster)), 
     (None, Item("armor piece",  30)) # unlimited stock 
    ) 

    # create a buyer 
    jeff = Character("Jeff") 

    # visit the store 
    shop.visit(jeff) 

if __name__ == "__main__": 
    main()