Which command is used to check if a package is installed in Python?

The command "pip show package_name" is used to check if a specific package is installed in Python. When executed, this command displays detailed information about the package, including its version, installation location, dependencies, and other relevant metadata. If the package is not installed, it will simply not return any information.

This command is essential for managing packages in Python, especially when working in environments where multiple packages are installed, as it allows developers to verify the presence and specifics of a package before attempting to use it in their code.

Other commands mentioned, such as "pip check package_name," serve different purposes, like checking for broken dependencies but do not confirm the installation of a package. Similarly, "pip3 verify package_name" is not a valid command in the pip suite. "check package_name" does not correspond to any recognized pip command for package management. Hence, "pip show package_name" is the correct and widely accepted command to check for the installation of a Python package.