How to define [] for class in Python?

Question

I feel like this question has already been asked and answered, yet I couldn't find anything on-topic, so excuse me if it is so. I want to define the behaviour of [] brackets when applied to class, similar to def []=() construct in ruby, so that calling Python obj['foo'] would actually call some [](self, what) method. How can I do that?

Cat Plus Plus · Accepted Answer · 2009-09-29 18:25:51Z

11

It's all in the docs: __getitem__.

answered Sep 29, 2009 at 18:25

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Lennart Regebro · Accepted Answer · 2009-09-29 18:26:39Z

7

This is done with __getitem___ in Python.

Here is a list of all the operators: http://docs.python.org/library/operator.html

answered Sep 29, 2009 at 18:26

Lennart Regebro

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physicsmichael Over a year ago

Thanks for linking the entire list of operators. It eluded me, and probably many others.

Ayman · Accepted Answer · 2009-09-29 18:28:13Z

5

define a method in your class with __getitem__(key) and __setitem__(key, value)

answered Sep 29, 2009 at 18:28

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FModa3 · Accepted Answer · 2009-09-29 18:29:13Z

4

http://docs.python.org/reference/datamodel.html

Section 3.4 in the above link shows you all or most of the operators you can overload in Python. The one you want to overload is

__getitem__()

answered Sep 29, 2009 at 18:29

FModa3

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