What is class in python

A memorandum for myself. Focused on understanding at the cost of accuracy.

class is

A blue print for creating objects.

Introduction

As introduced in the previous post, object is a package of methods and data. class is a blue print or template to create those objects. Every time you call a class, you will create a new object (which is called Instance.

Example

class.py

# declare that this is a blue print of "glass_of_water"
class glass_of_water: 
    # first, you have water as your data
    my_data = 'water'
    # this is called attribute

    # then, define the method
    def pour(self):    
        # this is the actual action of the method
        print('pour ' + self.my_data)   

Let's try to run this code.
First, create an object with the blue print of glass_of_water.

object1 = glass_of_water()

Now you run it.

>>> object1
<__main__.glass_of_water at 0x7f7fb0a76198>

You get nothing because you didn't specify what to do, i.e. the method.
Let's do it again.

>>> object1.pour()
pour water

Reference

https://www.hackerearth.com/practice/python/object-oriented-programming/classes-and-objects-i/tutorial/
https://qiita.com/lamplus/items/351145a81f798ecec80b
https://qiita.com/hiroyuki_mrp/items/140d47df01553091d59a