Configure Python on Linux

The command `sudo apt install python3 python-is-python3 python3-pip python3-flask uvicorn -y` is used to install several packages on an Ubuntu system. Let's break down the command and explain each component:

- `sudo`: It stands for "superuser do" and is used to run the subsequent command with administrative privileges. You will be prompted to enter your password.

- `apt`: It is the package management command for APT (Advanced Package Tool) on Ubuntu systems.

- `install`: This command instructs APT to install the specified packages.

- `python3`: It refers to the package that provides the Python 3 interpreter. This command ensures Python 3 is installed on your system.

- `python-is-python3`: This package is not necessary for most Ubuntu systems. It provides a symbolic link from `python` to `python3`, making `python` refer to Python 3. As mentioned before, Python 3 is already the default in most cases.

- `python3-pip`: It is the package that provides PIP (Python Package Installer) for Python 3. PIP is a tool used to manage Python packages.

- `python3-flask`: This package provides the Flask web framework for Python 3. Flask is a popular framework for building web applications in Python.

- `uvicorn`: It is a package used for serving Python web applications, particularly those built with ASGI (Asynchronous Server Gateway Interface) frameworks like FastAPI and Starlette.

- `-y`: The `-y` flag is used to automatically answer "yes" to any prompts during the installation process, allowing the installation to proceed without manual confirmation.

Putting it all together, the command installs Python 3, PIP for Python 3, Flask, and Uvicorn on your Ubuntu system, ensuring you have the necessary dependencies for Python web development with Flask and running applications with Uvicorn.

To check if Gunicorn is installed on your system, you can use the following steps depending on your operating system and setup:

1. Command-Line Check:

Open a terminal or command prompt and enter the following command:

gunicorn --version

If Gunicorn is installed, this command will display the version number of the installed Gunicorn package. If Gunicorn is not installed, you will receive an error indicating that the command is not recognized.

2. Package Manager Check:

If you installed Gunicorn using a package manager like `pip`, you can use the package manager to check if Gunicorn is installed. Open a terminal or command prompt and enter the following command:

pip show gunicorn

If Gunicorn is installed, this command will display information about the installed Gunicorn package, including the version number. If Gunicorn is not installed, you will see an error indicating that the package is not found.

3. Python Check:

You can also check for Gunicorn's presence within a Python environment. Open a Python interpreter by running the `python` or `python3` command in a terminal or command prompt. Then, enter the following Python code:

python

   import gunicorn

   print(gunicorn.__version__)

If Gunicorn is installed, this code will print the version number of the installed Gunicorn package. If Gunicorn is not installed, you will see an error indicating that the module cannot be found.

By using one of these methods, you can verify if Gunicorn is installed on your system.