编写类，以便调用实例返回所有实例变量 [英] Write class such that calling instance returns all instance variables

问题描述

我已经回答了我自己的问题-参见下面的答案
我正在写一个类，并且我想要这种行为:

I have answered my own question - see answer below
I'm writing a class, and I want this behavior:

a = f(10,20)
some_funct(a.row) # some_function is given 10
some_funct(a.col) # some_function is given 20
some_funct(a)     # some_function is given a tuple of 10, 20  <-- THIS ONE :)

最近的行为使我很沮丧.我没有看到任何涵盖此内容的示例.

The last behavior is stumping me. I have not seen any examples that cover this.

到此为止:

Thus far:

class f(object):
    """Simple 2d object"""
    row: int
    col: int

    def __init__(self, row, col):
        self.row = row
        self.col = col

明确地说，我不需要其他方法，例如self.both = row，col.我只想调用"该实例

Explictly I do not want another method, say, self.both = row, col. I just want to 'call' the instance

我是班上的新手，所以我们欢迎您进行任何改进.属性，设置器，获取器等.

I'm new to classes, so any improvements are welcome. Properties, setters, getters etc.

替换为打印"带有"some_function"问题中，并修改标题

EDIT 1: Replaced "print" with "some_function" in the question, and modified title

推荐答案

class f(tuple):
    """Simple 2d object"""
    def __new__(cls, x, y):
        return tuple.__new__(f, (x, y))

    def __init__(self, x, y):
        self.col = x
        self.row = y

foo = f(1,2)
print(foo.col)
>>>1
print(foo.row)
>>>2
print(foo)
>>>(1, 2)

重要:
如果希望它的行为像元组，则使其成为元组的子类.

Importantly:
If you want it to behave like a tuple then make it a subclass of tuple.

很多东西，但偶然发现了外部站点为我提供了有关此处要搜索的关键字的线索.SO问题是此处，但我对此答案做了一些修改.
我仍然有些困惑，因为另一个站点表示也要在初始化中使用 new ，但没有给出明确的示例.

Much stuffing around but stumbled upon an external site which gave me clues about the keywords to search on here. The SO question is here but I have modified that answer slightly.
I'm still a little confused because the other site says to use new in the init as well but does not give a clear example.

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