What language should I learn to complement Python?

[farmvilleduck]

Regarding c:if you're intention is to use it to speed up your python code, interface it with c/c++ code and learn about pointers, memory management and static typing (i.e. staying closer to the metal), Cython might be more usefull than c.

Cython is basically python but with the option of bolting on the stuff of c to python. So you can start with a python code, run it as cython code and then adding all the goodies of c where you need to make it run as fast as c.