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Introduction to Programming using Python - Programming Course for Biologists at the Pasteur Institute

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doctest - doctest is a module included in the Python programming language's standard library that allows the easy generation of tests based on output from the standard Python interpreter shell, cut and pasted into docstrings.

doctest — Test interactive Python examples - The doctest module searches for pieces of text that look like interactive Python sessions, and then executes those sessions to verify that they work exactly as shown.

A Brief Introduction to Epytext - Epytext is a simple lightweight markup language that lets you add formatting and structure to docstrings. Epydoc uses that formatting and structure to produce nicely formatted API documentation.