[英]Set addition, subtraction, union between instances
What method(s) do I need to define in my class to be able to add together the following:我需要在我的类中定义什么方法才能将以下内容相加:
combined_set = set('a') | MyInstance
# want to get set(['a', MyInstance]) // instance is hashable
TypeError: unsupported operand type(s) for |: 'set' and 'MyInstance'
Unions, intersections, differences and symmetric differences of sets using the overloaded operators |
使用重载运算符的集合的并、交、差和对称差
|
, &
, -
and ^
have to be done on two sets , not a set and a single element. ,
&
, -
和^
必须在两个集合上完成,而不是一个集合和一个元素。 But you can write {MyInstance}
instead of MyInstance
to have a set containing that single element.但是您可以编写
{MyInstance}
而不是MyInstance
来拥有一个包含该单个元素的集合。
>>> the_set = {'a'}
>>> element = 'b'
>>> the_set | {element}
{'a', 'b'}
>>> the_set & {element}
set()
>>> the_set - {element}
{'a'}
>>> the_set ^ {element}
{'a', 'b'}
As HeapOverflow points out, if you use the union
, intersection
, difference
or symmetric_difference
methods instead of the overloaded operators, the argument only needs to be an iterable, not necessarily a set;正如 HeapOverflow 指出的那样,如果您使用
union
、 intersection
、 difference
或symmetric_difference
方法而不是重载运算符,则参数只需要是可迭代的,不一定是集合; but that doesn't help in your case.但这对你的情况没有帮助。
You could do it one of these ways:您可以通过以下方式之一进行操作:
combined_set = set(('a', MyInstance))
combined_set = set('a') | { MyInstance }
combined_set = set('a')
combined_set.add(MyInstance)
You can define a你可以定义一个
__ior__(self, value)
for your class.为你的班级。
where value can be booth a set or another instance of your class.其中 value 可以是您的班级的集合或另一个实例。
But of course your class need to inherit from set.但是当然你的类需要从 set 继承。
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