Basic quantum computing concepts implemented in Python

In what might not come entirely as a surprise, Damian Conway has been along this road a long while ago: <a href="http://search.cpan.org/~dconway/Quantum-Superpositions-1.03/lib/Quantum/Superpositions.pm" rel="nofollow">http://search.cpan.org/~dconway/Quantum-Superpositions-1.03/...</a>

Hasn't SymPy done this for a while?<p><a href="http://docs.sympy.org/0.7.2-py3k/modules/physics/quantum/index.html" rel="nofollow">http://docs.sympy.org/0.7.2-py3k/modules/physics/quantum/ind...</a>

It would be great if the functions were documented in a way to show what these gates do and why they exist anyway. Not everybody has some pre education on quantum computing, right?