pygene - simple python genetic algorithms/programming library

I played around with this a bit before I decided on pyevolve instead.  However, pygene might suit your needs better.

pygene - simple python genetic algorithms/programming library

blaa/PyGene · GitHub

Pyevolve genetic algorithm python software

I have used this software to successfully create a genetic algorithm python script that I use to tune parameters on extra tree classifiers and RDF classifiers.  It is pretty easy to use and you can make almost any type of GA with it.  It is open source so you can go in a tinker with it.

Welcome to Pyevolve documentation ! — Pyevolve v0.5 documentation

There is a great pyevolve tutorial here:

A Coder's Musings: Curve fitting with Pyevolve