Add a few comments in py_generator.js
Add a few comments in py_generator.js

amrdraz/brython,Lh4cKg/brython,olemis/brython,kevinmel2000/brython,Hasimir/brython,JohnDenker/brython,Lh4cKg/brython,jonathanverner/brython,amrdraz/brython,kikocorreoso/brython,brython-dev/brython,molebot/brython,Hasimir/brython,JohnDenker/brython,rubyinhell/brython,rubyinhell/brython,amrdraz/brython,amrdraz/brython,rubyinhell/brython,Hasimir/brython,brython-dev/brython,kevinmel2000/brython,olemis/brython,brython-dev/brython,molebot/brython,rubyinhell/brython,kikocorreoso/brython,kikocorreoso/brython,JohnDenker/brython,olemis/brython,molebot/brython,olemis/brython,Mozhuowen/brython,kevinmel2000/brython,kevinmel2000/brython,Lh4cKg/brython,Isendir/brython,Mozhuowen/brython,Mozhuowen/brython,Hasimir/brython,jonathanverner/brython,jonathanverner/brython,Isendir/brython,Lh4cKg/brython,Isendir/brython,jonathanverner/brython,Mozhuowen/brython,Isendir/brython,JohnDenker/brython,molebot/brython