Python: Directly access to attribute in a dict-like way

Question

I have a class that handles a Numpy matrix and some additional infos.

import numpy as np

class MyClass:
    def __init__(self, v):
        self.values = v

plop = MyClass(np.matrix([[1, 2], [3, 4]]))

The matrix being named values, to access it, I write:

plop.values[1, 1]  # Returns 4

Is it possible to access it directly? I mean, doing:

plop[1, 1]  # Should returns 4 too

I saw this post but it seams that this solution allows only one level of [].

Thanks!

Actually, there are others attributes to MyClass that I didn't write here. — Picani
– Picani, Commented Nov 22, 2016 at 14:12

blue note · Accepted Answer · 2016-11-22 14:02:13Z

4

Just add this method to you class

def __getitem__(self, indices):
    return self.values[indices]

Also, given the opportunity, it would be useful to see how __getitem__ and slice objects work

answered Nov 22, 2016 at 14:02

blue note

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Comments

tlyhenry · Accepted Answer · 2016-11-22 14:04:59Z

-1

you access it directly I think.

plop = np.matrix([[1, 2], [3, 4]])

plot[1, 1]

answered Nov 22, 2016 at 14:04

tlyhenry

353 bronze badges

To quote OP: "there are others attributes to MyClass that I didn't write here" so plop must be an instance of MyClass