我正在编写游戏以尝试提高我在python中的技能。在这部分代码中，我试图用金钱系统对一个商店进行编程，测试一个变量对5个不同的可能答案
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()
当您输入health potion时，代码会像正常情况一样继续，但是其他输入会转到代码的这一部分
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()
答案 0 :(得分：0)
为了好玩，这是一个更高级的版本。
如果一切都没有意义，请不要担心;尝试追踪它并弄清楚它是如何工作的。一旦你完全理解它，你将更好地掌握Python！
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()
答案 1 :(得分：-2)
您的问题在于此声明：
if choice!="health potion" and "strength potion" and "strength booster" and "armour piece" and "nothing":
比较像这样的字符串不起作用。您需要确保它不在字符串数组中
if choice not in ("health potion","strength potion","strength booster","armour piece","nothing"):
否则它将永远为真，因此第一个语句将始终执行。