A "reproducible document" with an extended version of SPySort: Neuronal Spike Sorting with Python Proceedings of the 7th European Conference on Python in Science (EuroSciPy 2014), edited by Pierre de Buyl and Nelle Varoquaux, pp. 27–34. The text of this extended version A Prelude to SPySort: Neuronal Spike Sorting with Python is available on the preprint server HAL (hal-01111654, version 1). The source file is written with org-mode a mode of the emacs editor; it is pure UTF-8 and can be opened wtih any text editor.