Check Installed Modules in Python

You can check the installed modules (also known as packages or libraries) in your Python environment using a few different methods. Here are three common methods:

1. Using pip list or pip freeze (Command Line): Open your terminal or command prompt and run one of the following commands: To list installed packages with version numbers using pip list:

   pip list

To generate a requirements file containing all installed packages and their versions using pip freeze:

   pip freeze > requirements.txt

The requirements.txt file will contain a list of installed packages that you can use to recreate the environment on another system.

2. Using pkg_resources (Python Code): You can also check for installed packages programmatically using the pkg_resources module. Here’s an example:

   import pkg_resources

   installed_packages = pkg_resources.working_set
   installed_package_names = [package.project_name for package in installed_packages]

   print(installed_package_names)

This code snippet will print the names of all installed packages in your Python environment.

3. Using pipdeptree (Third-Party Tool): pipdeptree is a third-party tool that can help you visualize the dependency tree of your installed packages. You can install it using pip:

   pip install pipdeptree

Once installed, you can run the following command to see the dependency tree:

   pipdeptree

It will display a tree-like structure of installed packages and their dependencies.

Choose the method that best suits your needs and workflow. The first two methods are built-in and can be used directly from the command line or within your Python code. The third method, using pipdeptree, provides a more detailed view of package dependencies.