Hello Ars, may I have your input? I'm working on a project with python 2.7 and Raspberry Pi wherein I'm polling some sensors and upon determining which value is being received, logging the data ...

Just a couple of physics notes: I wrote r as a scalar. This is the magnitude of the vector r.; The 1 over 4πε 0 is just a constant.; Electric potential is a scalar quantity, not a vector.