[FIXED] Creating on object accessible by several methods

Issue

When I open a netcdf file with xarray (see [https://docs.xarray.dev/en/stable/index.html]) :

dd = xarray.open_dataset (file)

I obtain an object that can be accessed by two methods :

dd.var    # Like a namespace or class
dd['var'] # Like a dictionnary

I'm looking to create an object, class or whatever, that can be accessed in the same way, using any of these two methods.

xarray shows that such objects are feasible. But how ?

Thanks in advance

Solution

What you are looking for is __getitem__ dunder method. You can implement this method in your class to return the attributes using square bracket access method.

A sample implementation can be as following:

class T:
    attr1 = 10
    def __getitem__(self, key):
        return getattr(self, key)

When we create an instance of class T, we can access attr1 by using dot operator or by using square brackets.

>>> t = T()
>>> t.attr1
10
>>> t['attr1']
10

Answered By - Jake Peralta