[Python] How to inherit and extend a list object in Python?

Discussão em 'Python' iniciado por Stack, Junho 16, 2025.

  1. Stack

    Stack Membro Participativo

    I am interested in using the python list object, but with slightly altered functionality. In particular, I would like the list to be 1-indexed instead of 0-indexed. E.g.:

    >> mylist = MyList()
    >> mylist.extend([1,2,3,4,5])
    >> print mylist[1]


    output should be: 1

    But when I changed the __getitem__() and __setitem__() methods to do this, I was getting a RuntimeError: maximum recursion depth exceeded error. I tinkered around with these methods a lot but this is basically what I had in there:

    class MyList(list):
    def __getitem__(self, key):
    return self[key-1]
    def __setitem__(self, key, item):
    self[key-1] = item


    I guess the problem is that self[key-1] is itself calling the same method it's defining. If so, how do I make it use the list() method instead of the MyList() method? I tried using super[key-1] instead of self[key-1] but that resulted in the complaint TypeError: 'type' object is unsubscriptable

    Any ideas? Also if you could point me at a good tutorial for this that'd be great!

    Thanks!

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