Why do you insist on python?? I have noticed in several of your threads you are determined to use python.. Python is an interpreted language, I would have thought that C or C++ would be better for audio as you can access direct x … Merging three or four notes to form chords is pretty straight forward but I have never seen python tools.. The only way is to use "directpython" but it's written in C++.
Do you just mean you want the notes in the chord printed out? e.g. printChord("A") -> "A C# E"
Or do you want an audio file created / played? Or MIDI messages sent?