Python 添加/删除列表中的项目
我正试图创建一个玩家谁可以添加和删除他们的库存项目。我的一切正常,我只有一个小问题。每次打印库存时,“无”也会出现。我一直在尝试删除它,但无论我做什么,“无”总是出现在程序中!我知道我只是错过了一些简单的事情,但我一辈子都想不出来Python 添加/删除列表中的项目,python,Python,我正试图创建一个玩家谁可以添加和删除他们的库存项目。我的一切正常,我只有一个小问题。每次打印库存时,“无”也会出现。我一直在尝试删除它,但无论我做什么,“无”总是出现在程序中!我知道我只是错过了一些简单的事情,但我一辈子都想不出来 class Player(object): def __init__(self, name, max_items, items): self.name=name self.max_items=max_items self.items=it
class Player(object):
def __init__(self, name, max_items, items):
self.name=name
self.max_items=max_items
self.items=items
def inventory(self):
for item in self.items:
print item
def take(self, new_item):
if len(self.items)<self.max_items:
self.items.append(new_item)
else:
print "You can't carry any more items!"
def drop(self, old_item):
if old_item in self.items:
self.items.remove(old_item)
else:
print "You don't have that item."
def main():
player=Player("Jimmy", 5, ['sword', 'shield', 'ax'])
print "Max items:", player.max_items
print "Inventory:", player.inventory()
choice=None
while choice!="0":
print \
"""
Inventory Man
0 - Quit
1 - Add an item to inventory
2 - Remove an item from inventory
"""
choice=raw_input("Choice: ")
print
if choice=="0":
print "Good-bye."
elif choice=="1":
new_item=raw_input("What item would you like to add to your inventory?")
player.take(new_item)
print "Inventory:", player.inventory()
elif choice=="2":
old_item=raw_input("What item would you like to remove from your inventory?")
player.drop(old_item)
print "Inventory:", player.inventory()
else:
print "\nSorry, but", choice, "isn't a valid choice."
main()
raw_input("Press enter to exit.")
class播放器(对象):
定义初始项(自身、名称、最大项、项):
self.name=name
self.max\u items=max\u items
self.items=项目
def库存(自我):
对于self.items中的项目:
打印项目
def接收(自身、新项目):
如果len(self.items)则问题在于以下陈述:
print "Inventory:", player.inventory()
您正在告诉Python打印从player.inventory()返回的值。但是您的inventory()方法只是打印库存,它不返回任何内容,因此返回值隐式为None
您可能希望明确选择以下选项之一:
print "Inventory:"
player.print_inventory()
或者,您可以让它返回一个字符串并执行以下操作:
print "Inventory:", player.inventory_as_str()
您是否介意更换该功能:
def inventory(self):
for item in self.items:
print item
def print_inventory(self):
print "Inventory:"
for item in self.items:
print item
为此:
def inventory(self):
print self.items
然后打电话:
print "Inventory"
player.inventory()
或者您可以使用以下功能:
def inventory(self):
for item in self.items:
print item
def print_inventory(self):
print "Inventory:"
for item in self.items:
print item
你能发布你的输入和输出的样本吗?谢谢!我知道这很简单。我所要做的就是去掉那个逗号,哈哈。