Python重载多个getitems/索引请求 [英] Python overloading multiple getitems / index requests

问题描述

我有一个要使用myGrid[1][2]访问的Grid类.我知道我可以使用__getitem__()方法重载第一组方括号，但是第二组呢?

I have a Grid class which I want to access using myGrid[1][2]. I know I can overload the first set of square brackets with the __getitem__() method, but what about the second.

我想我可以通过创建一个同时实现__getitem__的帮助程序类来实现此目标，然后:

I thought I could achieve this by having a helper class which also implements __getitem__ and then:

class Grid:

    def __init__(self)
        self.list = A TWO DIMENSIONAL LIST       

    ...

    def __getitem__(self, index):
        return GridIndexHelper(self, index)

class GridIndexHelper:

    def __init__(self, grid, index1):
        self.grid = grid
        self.index1 = index1

    ....

    def __getitem__(self, index):
        return self.grid.list[self.index1][index]

这似乎有点太自酿了……实现此目标的python方法是什么?

This seems a little too homebrewed... What is the python way to achieve this?

推荐答案

class Grid:

    def __init__(self):
        self.list = [[1,2], [3,4]]

    def __getitem__(self, index):
        return self.list[index]

g = Grid();

print g[0]
print g[1]
print g[0][1]

打印

[1, 2]
[3, 4]
2

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