Important Python modules

Modules, or code libraries that can be called by a script to increase its programming potential, are either built into Python, or are created by third parties, and added later to Python. Most of these are written in Python, but a number of them are also written in other programming languages, and then "wrapped" in Python to make them available within Python scripts. Wrappers are also used to make other software available to Python, such as the tools built into Microsoft Excel.