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Introduction to Python

Python is an open source programming language and it is among the top five most popular languages in the world. It is a good programming language for beginners. Writing programs in Python takes less time than in some other languages like C, C++, Java. Latest version of python is python3.

Why most of them love python ❤️

Python is not only used for general problem solving but also for the development of high-level applications like -

  • Web Development: Can perform server side programming through Python libraries like Django and Flask.

  • Prototyping: Can create quick prototypes to present the client.

  • Game Development: Used in the development of games through libraries like PyGame.

  • Data Science and Machine Learning: It has a great community and a vast range of libraries.

Why Python ? 🤔

  • 😃 Easy to read and learn: The syntax is very simple and straightforward.

  • 👌 Speedy: Execution of the code is very fast.

  • ⚡ Extensible: Python can be extended to other languages.

  • 😍 Free and Open-Source: It is freely available, can download its source code, make changes to it, and even distribute it.

  • 😮 Interpreted: Python directly executes the code line by line and not need to be compiled to run.

  • 💥 Protection: It avoids the harm from software bugs.

How to install Python in Windows 10 ?

1. Download the Python Installer

  • Open the Python Website in your browser.

  • In the Downloads tab choose the latest version of Python(Python 3.8.5) and click on it to download.

  • An Executable file will be downloaded.

2. Run the Executable Installer

  • After the completion of download, run the Python Installer.

  • Select the check box containing the Install launcher for all users.

  • Click on Customize Installation.

  • Select the check boxes contaning Documentaion, pip, tcl/tk and IDLE, Python test suit, py launcher for all users.

  • Click on next button.

  • This takes you to Advanced Options.

  • Here, select the check boxes containg Install for all users and Add Python to environment variables.

  • Click on Install button to start installation.

  • Once the installation is over, you will see a Python Setup Successful window.

3. Adding Python to environmental variables

  • In the start menu, search for View advanced system settings and open it.

  • In the System Properties window, click on the Advanced tab and then click on the Environment Variables button.

  • In the System Variables window, select the Path variable.

  • Click on NEW and name the variable as PATH and variable value as the path C:\Program Files (x86)\Python38-32;C:\Program Files (x86)\Python38-32\Lib\site-packages;C:\Program Files (x86)\Python38-32\Scripts.

  • Click OK.

4. Verify the Python Installation

  • In the start menu, search for Command Prompt and open it.

  • After opening, to check the installation, type python or python-version or python -V in command prompt.

  • You can see the python version you have installed.

  • Another alternative is you can search for IDLE(Python version) in the start menu.

  • A python shell will be opened where you can work on python.

Basic Syntax in Python3

1. print() Function

The print function in Python is a function that outputs to your console window whatever you say you want to print out.

For Strings : print("string or any sentence")
For Numbers : print(number)
For Operations with numbers : print(number1 operation number2)

Input:

print("Hello World")
print("welcome to python3")
print(3)
print(5+4)
print(6-2)
print(4/2)

Output:

Hello World
welcome to python3
3
9
4
2.0

2. Value initialization

In python there is no need to declare the datatype(string,integer,....) of the varaiables before initialization.

For Strings : variable = "string or a sentence"
For Integers : variable = number
For Operations with integers : variable = number1 operation number2
variable = variable1 operation variable2

Input:

a = "What is your name?"
print(a)
b = 7
print(b)
c = 3
print(c)
d = b + c
print(d)

Output:

Here, a = "What is your name?", so by the statement print(a) the output is
What is your name?
Here, b = 7, so by the statement print(b) the output is
7
Here, c = 3, so by the statement print(c) the output is
3
Here, d = b + c , so d = 7 + 3 = 10, so by the statement print(d) the output is
10

3. Value Input

In python In python there is no need to declare the datatype(string,integer,....) of the varaiables before taking the input.

For Strings : variable = input()
For Integers : variable = int(input())
For Float : variable = float(input())

Input:

x = input()
print(x)
y = int(input())
print(y)
z = float(input())
print(z)

Output:

Here, by taking input as x = "Hello", so by the statement print(x) the output is
Hello
Here, by taking input as y = 8, so by the statement print(y) the output is
8
Here, by taking input as z = 10.63, so by the statement print(z) the output is
10.63

4. Comments

Comments are used to explain what the code does in each line. Python will ignore the Comments.

Single line comment : We use '#' ( #comment )
Multi line comments :
#comment1
#comment2
.
.
.
or
We can use Multi line string : we represent by
""" comment1
comment2
.
.
. """

To get the Python Tutorial click here

Thanks for Reading!!!

Regards
CHAITHANYA

You can contact me through this mail 👉 📧 [email protected]

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