[PyTUT 4] VARIABLES AND COMMENTS

Hi everybody, this is a small tutorial I want to show you before introducing arrays in Python because we will use it in the next tutorial.

Related topics

[PyTUT 2] NUMBERS AND OPERATORS

[PyTUT 3] STRINGS

Variables

To put it simply, we can think of a variable as a name of a value which can be a number, string, list, tuple, or even dictionary. In fact, every time when we declare a variable, the interpreter will allocate memory for its value.

A value can be assigned to a variable by using equal sign = and it can be any type of data such as number, string, or array data type in Python (list, tuple, and dictionary).

>>> a = 8
>>> b = 9.0
>>> c = float(a)
>>> print c
>>> 8.0
>>> d = 'Hello '
>>> e = 'Adele'

To access a value from a string or number type variable, we simply call and perform operations with its name.

>>> s = a + b
>>> print s
>>> 17.0
>>> st = d + e
>>> print st
>>> Hello Adele

See that, whatever you can do with 2 numbers or 2 strings, you can also do with 2 variables which stores 2 numbers or 2 strings.

However, it is different when accessing value from array data types in Python. In the next tutorial, I will introduce to you how to deal with it.

Comments

Sometimes, you may make a long code in your project and it will be tough to work with it again after a long time if you don’t note the meaning of parts in your program. That’s why we need to use comments in our program. A comment is made by putting a hash mark # before a message.

>>> theta = 5.0 # initializing theta
>>> bias = 1.3 # initializing bias
>>> x = 2 # initializing variable
>>> y = theta*x + bias # estimating the model

Although all comments are ignored by Python interpreter, it is an crucial part in a Python program. The more you make good comments in your code, the more you save your time.

That’s all. Is it easy?

In the next tutorial I will introduce array data types used in Python. Well, it will be a long tutorial and you will have a lot of things to do.

 

Hope you enjoy it,

Curious Chick

4 thoughts on “[PyTUT 4] VARIABLES AND COMMENTS

    1. Hi outlierskrp, thanks for your attention.

      Honestly, my purpose of making this tutorial series is not to introduce all aspects of Python, but try to make a shortened version to support my next series of tutorials about Machine Learning using Python.

      Hope to get some advice from you to make it better!
      Curious Chick

      Liked by 1 person

  1. Wow, really hard work.

    I learned Python with two first books you’re reading. I cannot recommend any books that are better than it. On the other hand, I practiced more from exercises in Learn Python the Hard way and the Python Workbook.

    I hope to get some advice from you to make my tutorial better!
    Curious Chick

    Like

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