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Installing Python

Before writing and running Python programs, the Python interpreter must be installed on your system.

Python distributions can be downloaded from the official Python website:

https://www.python.org

The installation process typically involves three main steps:

  1. downloading the Python installer
  2. installing the interpreter
  3. verifying that the installation works
flowchart TD
    A[Download Python]
    A --> B[Install Interpreter]
    B --> C[Verify Installation]

Once Python is installed successfully, programs can be executed from the terminal or through development tools.

1. Installing on Windows

Installing Python on Windows usually involves running a graphical installer.

Steps

  1. Download the installer from the official Python website.
  2. Run the installer executable.
  3. Enable the Add Python to PATH option.
  4. Complete the installation process.

Adding Python to the system PATH allows Python to be executed from the command prompt.

Verifying the Installation

Open the command prompt and run:

python --version

If installation was successful, the interpreter prints the installed version:

Python 3.x.x

2. Installing on macOS

Some versions of macOS include Python by default, but installing the latest version is recommended.

Steps

  1. Download the macOS installer from the official Python website.
  2. Run the .pkg installation file.
  3. Follow the installation instructions.

Verifying the Installation

Open the terminal and run:

python3 --version

If Python is installed correctly, the terminal displays the installed version number.

3. Installing on Linux

Most Linux distributions include Python as part of the operating system.

However, Python can also be installed or updated using the system package manager.

Example for Ubuntu-based systems:

sudo apt install python3

Verifying the Installation

Run:

python3 --version

This confirms that Python is installed and available.

4. Starting the Python Interpreter

After installation, the Python interpreter can be started from the terminal.

Example:

python

or

python3

If successful, the interpreter starts an interactive session.

Example:

Python 3.x.x
>>>

The >>> prompt indicates that Python is ready to execute commands.

5. Example Interpreter Session

The interpreter allows immediate execution of Python expressions.

Example:

>>> print("Hello Python")

Output:

Hello Python

This interactive mode is useful for testing small pieces of code.

6. Updating Python

Python is actively maintained and improved.

New versions typically include:

  • performance improvements
  • bug fixes
  • security updates
  • new language features

Updating Python periodically ensures access to the latest capabilities.

7. Summary

Key ideas from this section:

  • Python must be installed before writing and running programs.
  • Installation steps differ slightly across operating systems.
  • The interpreter can be verified using the python --version command.
  • After installation, Python can be launched from the terminal.
  • Keeping Python updated helps maintain security and performance.

Once Python is installed and verified, the next step is learning how to interact with the interpreter and run Python programs.