Changing how to access data inside an instance

Python Help
1

I want to create a class that holds a 2D numpy array with arbitrary n x m size. The class could look like

Class Img:
          def __init__(self, data):
               self.data = data

Say that I have read such a 2D array called sample hence,

A = Img(sample)

I would like to be able to access the values in A in the following way,

value = A[2, 3] # this would return the value at row= 2 and column=3

Rather than this,

value = A.data[2,3]

Is there a way to achieve this?

Hope this makes sense.

Thanks

2

Have a look a the __getitem__ special method.
See 3. Data model — Python 3.12.1 documentation
Maybe that is what you want?
Note that the key will need to be a tuple.
So that the access is:

value = A[(2,3)]
3

The key doesn’t need to be a tuple. A[(2, 3)] and A[2, 3] are treated the same.

Also, the __init__ method in the original post was missing self.

4

Thank you @barry-scott and @MRAB I will check this out!!

Thanks @MRAB I just corrected this!

5

For those who might be interested. Here is the solution.

Class Img:
          def __init__(self, data):
               self.data = data

           def __getitem__(self, key):
               return self.data[key]

So if I have a 2D array called sample hence,

A = Img(sample)

I can access the values in A in the following way,

value = A[2, 3] # this would return the value at row= 2 and column=3

Note that there is no check here as to whether the key values are within the proper bounds.

Thanks again to @barry-scott and @MRAB