Python 3 Installation & Setup Guide

To get started working with Python 3, you’ll need to have access to the Python interpreter. There are several common ways to accomplish this:

• Python can be obtained from the Python Software Foundation website at python.org. Typically, that involves downloading the appropriate installer for your operating system and running it on your machine.
• Some operating systems, notably Linux, provide a package manager that can be run to install Python.
• On macOS, the best way to install Python 3 involves installing a package manager called Homebrew. You’ll see how to do this in the relevant section in the tutorial.
• On mobile operating systems like Android and iOS, you can install apps that provide a Python programming environment. This can be a great way to practice your coding skills on the go.

Alternatively, there are several websites that allow you to access a Python interpreter online without installing anything on your computer at all.

GOOGLE NOTEBOOK - It is an online Jupyter Notebook, here you can run python code and as well as install external libraries.

• To setup Python3 Notebook
• Click on File and click on New Python3 Notebook

REPL.IT - Online Python3 Interpreter for writing programs

Python 3.6 Installation Linux (Ubuntu):

Install the following dependencies:

$ sudo apt-get update

$ sudo apt-get install build-essential checkinstall

$ sudo apt-get install libreadline-gplv2-dev libncursesw5-dev libssl-dev libsqlite3-dev tk-dev libgdbm-dev libc6-dev libbz2-dev

• Go to Download Python page on https://www.python.org/downloads/ and click Download Python 3.6.4 (You may see different version name).

• In the terminal, go to the directory where the file is downloaded and run the command:

  $ tar -xvf Python-3.6.4.tgz

   

• This will extract your zipped file. Note: The filename will be different if you've downloaded a different version. Use the appropriate filename.

• Go to the extracted directory.

  $ cd Python-3.6.4

   

• Issue the following commands to compile Python source code on your Operating system.

  $ ./configure

  $ make

  $ make install

   

• Open Sublime text. To create a new file, go to File > New File (Shortcut: Ctrl+N).

• Save the file with .py file extension like: hello.py or first-program.py

• Write the code and save it (Ctrl+S or File > Save). For starters, you can copy the code below:

  print("Hello, World!")

   

• This simple program outputs "Hello, World!"

• Go to Tool > Build (Shortcut: Ctrl+B). You will see the output at the bottom of Sublime Text. Congratulations, you've successfully run your first Python program.

Install and Run Python in Windows

• Go to Download Python page on https://www.python.org/downloads/ and click Download Python 3.6.4 (You may see different version name).
• If your computer is running a 64-bit version of Windows, download the Windows x86-64 executable installer. Otherwise, download the Windows x86 executable installer. After downloading the installer, you should run it (doubleclick on it) and follow the instructions there.
• One thing to watch out for: During the installation you will notice a window marked "Setup". Make sure you tick the "Add Python 3.6 to PATH" checkbox and click on "Install Now".
• When Python is installed, a program called IDLE is also installed along with it. It provides graphical user interface to work with Python.

• Open IDLE, copy the following code below and press enter.

  print("Hello, World!")

   

• To create a file in IDLE, go to File > New Window (Shortcut: Ctrl+N).
• Write Python code (you can copy the code below for now) and save (Shortcut: Ctrl+S) with .py file extension like: hello.py or your-first-program.py print("Hello, World!")
• Go to Run > Run module (Shortcut: F5) and you can see the output. Congratulations, you've successfully run your first Python program.

Install and Run Python using PyCharm

Refer https://www.jetbrains.com/pycharm/

Install and Run Python using Anaconda

Refer https://www.anaconda.com/download/

Introduction to Prompt Window

You now should see a white or black window that is waiting for your commands.

Prompt: Linux OS (Ubuntu)

If you're on Linux, you probably see $ , just like this: terminal

$

To run Python script test.py

$ python3 test.py

For pip3:

$ sudo apt-get -y install python3-pip

$ pip3 install package_name

Prompt: Windows OS

On Windows, it's a > sign, like this: command-line

>

To run Python script test.py

> python test.py

For pip:

> pip install package_name

To check the installed version of Python

For Windows

> python --version

#output
Python 3.6.4

For Linux

$ python3 --version

#Output
Python 3.6.4

Using the Python Shell

Before starting to write programs, you ’ ll need to learn how to experiment with the Python shell. For now, you can think of the Python shell as a way to peer within running Python code. It places you inside of a running instance of Python, into which you can feed programming code; at the same time, Python will do what you have asked it to do and will show you a little bit about how it responds to its environment. Because running programs often have a context — things that you as the programmer have tailored to your needs — it is an advantage to have the shell because it lets you experiment with the context you have created.

In Windows cmd prompt

> python

>>>

To exit

>>> exit()

In Linux Terminal

$ python3

>>>

To exit

>>> exit()