我想确定字典键的值处于以下哪种状态:
- 不存在
- 存在,但等于 int 为 0
- 存在,并且等于大于 0 的 int
这是我目前正在尝试的:
if item[itemTo] == 0:
print("You don't have a %s." % (itemTo))
elif item[itemTo] > 0:
print("You have %i of %s." % (item[itemTo]))
else:
print("%s doesn't exist." % (itemTo))
但是,当itemTo
不在item
字典中时,我在第 if item[itemTo] == 0:
行收到此错误:
KeyError: 'whatever_value_of_itemTo'
您想要更改测试的顺序:
if itemTo not in item:
print("%s doesn't exist." % (itemTo))
elif item[itemTo] > 0:
print("You have %i of %s." % (item[itemTo]))
else:
print("You don't have a %s." % (itemTo))