How to override the [] operator in Python?
You need to use the __getitem__ method.
class MyClass: def __getitem__(self, key): return key * 2myobj = MyClass()myobj[3] #Output: 6And if you're going to be setting values you'll need to implement the __setitem__ method too, otherwise this will happen:
>>> myobj[5] = 1Traceback (most recent call last): File "<stdin>", line 1, in <module>AttributeError: MyClass instance has no attribute '__setitem__'
To fully overload it you also need to implement the __setitem__and __delitem__ methods.
edit
I almost forgot... if you want to completely emulate a list, you also need __getslice__, __setslice__ and __delslice__.
There are all documented in http://docs.python.org/reference/datamodel.html
You are looking for the __getitem__ method. See http://docs.python.org/reference/datamodel.html, section 3.4.6