30-Days-Of-Python-master.zip

 🧳 [Part 1: Day 1 - 3](https://github.com/Asabeneh/30-Days-Of-Python) 🧳 [Part 2: Day 4 - 6](https://github.com/Asabeneh/30-Days-Of-Python/blob/master/readme4-6.md) 🧳 [Part 3: Day 7 - 9](https://github.com/Asabeneh/30-Days-Of-Python/blob/master/readme7-9.md) 🧳 [Part 4: Day 10 - 12](https://github.com/Asabeneh/30-Days-Of-Python/blob/master/readme10-12.md) 🧳 [Part 5: Day 13 - 15](https://github.com/Asabeneh/30-Days-Of-Python/blob/master/readme13-15.md) 🧳 [Part 6: Day 16 - 18](https://github.com/Asabeneh/30-Days-Of-Python/blob/master/readme16-18.md) 🧳 [Part 7: Day 19 - 21](https://github.com/Asabeneh/30-Days-Of-Python/blob/master/readme19-21.md) 🧳 [Part 8: Day 22 - 24](https://github.com/Asabeneh/30-Days-Of-Python/blob/master/readme22-24.md) 🧳 [Part 9: Day 25 - 27](https://github.com/Asabeneh/30-Days-Of-Python/blob/master/readme25-27.md) 🧳 [Part 10: Day 28 - 30](https://github.com/Asabeneh/30-Days-Of-Python/blob/master/readme28-30.md) --- - [📘 Day 1](#%f0%9f%93%98-day-1) - [Welcome](#welcome) - [Introduction](#introduction) - [Why Python ?](#why-python) - [Environment Setup](#environment-setup) - [Installing Python](#installing-python) - [Python Shell](#python-shell) - [Installing Visual Studio Code](#installing-visual-studio-code) - [How to use visual studio code](#how-to-use-visual-studio-code) - [Basic Python](#basic-python) - [Python Syntax](#python-syntax) - [Python Indentation](#python-indentation) - [Comment](#comment) - [Data types](#data-types) - [Number](#number) - [String](#string) - [Booleans](#booleans) - [List](#list) - [Dictionary](#dictionary) - [Tuple](#tuple) - [Set](#set) - [Checking Data types](#checking-data-types) - [Python File](#python-file) - [💻 Exercises - Day 1](#%f0%9f%92%bb-exercises---day-1) - [📘 Day 2](#%f0%9f%93%98-day-2) - [Built in functions](#built-in-functions) - [Variables](#variables) - [Data Types](#data-types-1) - [Checking Data types and Casting](#checking-data-types-and-casting) - [Number](#number-1) - [💻 Exercises - Day 2](#%f0%9f%92%bb-exercises---day-2) - [📘 Day 3](#%f0%9f%93%98-day-3) - [Boolean](#boolean) - [Operators:](#operators) - [Assignment Operators:](#assignment-operators) - [Arithmetic Operators:](#arithmetic-operators) - [Comparison Operators](#comparison-operators) - [Logical Operators](#logical-operators) - [💻 Exercises - Day 3](#%f0%9f%92%bb-exercises---day-3) # 📘 Day 1 ## Welcome **Congratulations** for deciding to participate in a **_30 days of Python_** programming challenge . In this challenge you will learn everything you need to be a python programmer and the whole concepts of programming. In the end of the challenge you will get a **_30DaysOfPython_** programming challenge certificate. [Join the telegram channel to get help](https://t.me/ThirtyDaysOfPython) ## Introduction Python is a high-level programming language for general-purpose programming. It is an open source. This 30 days python challenge will help you learn the latest version of Python, Python 3 step by step. The topics are broken down into 30 days, where each days contains several topics with easy-to-understand explanations, real-world examples and many hands on exercises. This challenge is designed for beginners and professionals who want to learn python programming language. ## Why Python ? It is a programming language which is very close to human language and because of that it is easy to learn and easy to use. Python used in varies industries including Google. It has been used to develop web applications, desktop applications, system adminstration, and machine learning libraries. Python is highly embraced language in the data science and machine learning community. I hope this is enough to convince you to start learning python. Python is eating the world and you are killing it before it eats you. ## Environment Setup ### Installing Python To run python script you need to install python. Let's [download](https://www.python.org/) python. If your are a windows user. Click the button encircled in red. [](https://www.python.org/) If you are a macOS user. Click the button encircled in red. [](https://www.python.org/) To check if python is installed write the following command on your device terminal. ```shell python --version ```  As you can see from the terminal, I am using _python 3.7.5_ version at the moment. If you mange to see the python version, well done. Python has been installed on your machine. Continue to the next section. ### Python Shell Python is an interpreted scripting language,so it doesn't need to be compiled. It means it executes the code line by line. Python comes with a _Python Shell (Python Interactive Shell)_. It is used to execute a single python command and get the result. Python Shell waits for the python code from the user. When you enter the code, it interprets the code and shows the result in the next line. Open your terminal or command prompt(cmd) and write: ```shell python ```  The python interactive shell is opened and it is waiting for you to write python code. You will write your python script next to this symbol >>> and then click Enter. Lets write our very first script on the python scripting shell.  Well done, you wrote your first python script on python interactive shell. How do we close this shell ? To close the shell, next to this symbol >> write **exit()** command and press Enter.  Now, you knew how to open the python interactive shell and how to exit from it. Python can give you result if you write scripts what python understands if not it returns errors. Let's make a deliberate mistake and see what python will return.  As you can see from the returned error, python is so clever that it knows the mistake we made and which was _Syntax Error: invalid syntax_. Using x as multiplication in python is a syntax error because (x) is not a valid syntax in python. Instead of (**x**) we use asterisk (*) for multiplication. The returned error clearly shows what to fix. The process of identifying and removing errors from a program is called *debugging*. Let's debug it by replacing * in place of **x**.  Our bug was fixed and the code run and we got a result we were expecting. As a programmer you will see such kind of errors on daily basis. It is good to know how to debug. To be good at debugging you should understand what kind of errors you are facing:SyntaxError, IndexError, ModuleNotFoundError, KeyError, ImportError etc. We will see more about different python **_error types_** in later section . Let's practice more , how to use python interactive shell. Go to your terminal or command prompt and write the word **python**.  The python interactive shell is open and lets do some basic mathematics operations(addition, subtraction, multiplication, division, modulus, exponential). Lets do some maths first before we write any python code: - 2 + 3 = 5 - 3 - 2 = 1 - 3 \* 2 = 6 - 3 / 2 = 1.5 - 3 ^ 2 = 3 x 3 = 9 In python we have the following additional operations: - 3 % 2 = 1 => which means finding the remainder - 3 // 2 = 1 => which means removing the remainder Lets change the above mathematical expressions to code. The python shell has been opened and lets write a comment at the very beginning of the shell.