Serhiy: "The C code looks cumbersome. It could be made a little simpler if accumulate arguments into a string rather than a list."

Utkarsh's first version used C code. I proposed to use a PyList and PyUnicodeObject strings to not have to compute the size of the char[] buffers.

The annoying part is to handle the ", " separator. I also had bad experiences with handling char* strings. It's so easy to make mistakes :-(

IMHO the current C code using Python objects is not that complex, but I don't really care of the implementation as soon as it works :-)