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Although optional, documentation is a good programming practice - especially if you want to get your dreamed job at Google, Apple, Facebook or anywhere in the World - and work collaboratively! Plus, unless you can remember what you had for dinner last week, always documenting your code will help you a lot when you will need to stay away for a while, then come back. You can attach documentation to a function definition by including a string literal called docstring, just after the function header. It is briefly used to explain what a function does. Note: Docstrings are usually triple quoted, to allow for multi-line descriptions.