Question

I would like to create a new class that acts as a special type of container for objects, and can be accessed using square brackets.

For example, suppose I have a class called ListWrapper. Suppose obj is a ListWrapper. When I say obj[0], I expect the method obj.access() to be called with 0 as an argument. Then, I can return whatever I want. Is this possible?

Answer 1

You want to define the special __getitem__^[docs] method.

class Test(object):     
    def __getitem__(self, arg):
        return str(arg)*3

test = Test()

print test[0]
print test['kitten']

Result:

000
kittenkittenkitten