What does it mean if a Python object is “subscriptable” or not?

Question

Which types of objects fall into the domain of "subscribable"?

Answer 1

In Python, the subscripting is nothing but indexing since it is the same as a mathematical notation that uses actual subscripts. In Python, for example, we use array[0] to get the first element of the array and the mathematicians use a₀ for the same thing. In simple words, objects which can be subscripted are called sub scriptable objects. In Python, strings, lists, tuples, and dictionaries fall in subscriptable category. 

If we use array[0], python implements array.__getitem__(0) to subscript the array. 

I recommend this Python Tutorial by Intellipaat to get started from the basics of Python.