Objects

So far we have been doing procedural programming, i.e., programming
with procedures/functions.

Python supports objects too.  So, we will taste a bit of
object-oriented programming, i.e., programming with objects.  I will
try to give you a flavor of object-oriented programming in Python
without getting deeply into it.

We have seen most of the built-in types, i.e., the types that come with
the base language Python.  There were two kinds:

    1. atomic data types, e.g., int, float, bool

    2. built-in compound data types, e.g., list, tuple, str

We can even create types that we as a programmer can define ourselves,
which are usually compound:

    3. user-defined compound data types

       Here, by 'user' we mean a Python programmer.


In Python, we create a new user-defined type by creating a new
'class'.

Once we create a class, which is a type, we can create instances (also
known as objects) of that class (type).

For example, if we create a class named Point, we can create point
instances (objects) such as p1, p2, p3, etc.

See points.py for details.

Incidentally, even the primitive data types are actually represented
as objects, but we won't get into that here.