Python

Python is a high-level, general-purpose programming language known for its readability and versatility. This guide covers basic setup and usage.

Installation

Most Linux distributions come with Python pre-installed. You can verify the installation by running:

python3 --version

If Python is not installed, you can install it using your system's package manager. For Debian-based systems, use:

sudo apt-get update
sudo apt-get install -y python3

It is a best practice to use virtual environments to manage dependencies for different projects separately.

Install the venv module if it's not already included:
```
sudo apt-get install -y python3-venv
```
Create a new virtual environment:
```
python3 -m venv my-project-env
```
Activate the environment:
```
source my-project-env/bin/activate
```
Your shell prompt will change to indicate that you are now in the virtual environment.
To deactivate the environment, simply run:
```
deactivate
```

Pip is the standard package installer for Python.

Install a package:
```
pip install <package-name>
```
Install packages from a requirements file:
```
pip install -r requirements.txt
```
Freeze dependencies: Create a requirements.txt file containing all the packages in the current environment.
```
pip freeze > requirements.txt
```

Create a file named hello.py with the following content:
```
print("Hello, World!")
```
Run the script from your terminal:
```
python3 hello.py
```
The output will be: Hello, World!.