How to view packages that have already been installed in Jupyter?

To view the installed packages, you can use the following command to list all installed packages:

!pip list

This will display a list of all installed packages and their version numbers in the current environment. You can run this command in a code cell in Jupyter Notebook and view the output to get the list of installed packages.

Alternatively, if you only want to check if a specific package is installed, you can use the following command:

!pip show package_name

Replace `package_name` with the actual name of the package you want to check. This will display detailed information about the package, including the version number, installation path, and more.