See which Python modules are available

What is a module?

Python is a programming language. A module is a ready-made set of code you can borrow, like a tool from a toolbox. Instead of writing everything yourself, you write import name and use the tool. Packages are bigger collections of modules.

Different Python versions and different virtual environments have different modules. A virtual environment is a private folder that keeps one app's tools apart from other apps.

Method 1: Ask pip

pip is the tool that installs and lists Python packages.

1. Open a terminal. On hosting, connect with SSH if it is enabled on your plan.
2. If your app uses a virtual environment, enter it first. In cPanel, the Setup Python App page shows the exact command to copy.
3. Run:

python -m pip list

This prints each installed package with its version. On some systems you must type python3 instead of python.

Method 2: Ask Python itself

1. Start Python:

python3

2. Type:

help("modules")

This prints a long list of every module Python can find, including built-in ones. It may take a moment.

3. Type exit() to leave.

Method 3: Test one module

If you only need to know whether one module exists, try to import it:

python3 -c "import requests; print(requests.__version__)"

If the module exists, you see its version. If not, you see "ModuleNotFoundError".

Method 4: Save the list

python -m pip freeze > requirements.txt

This writes the list into a file named requirements.txt. You can use it later to install the same set on another server.

If a module is missing

1. Enter the right virtual environment.
2. Run python -m pip install module-name.
3. Restart your app so it can use the new module.

Quick recap

• A module is ready-made code you can reuse.
• Use python -m pip list to see installed packages.
• Use help("modules") for the full list.
• Work inside the right virtual environment.