Listen to therocketeer, you can actually say that python is lightweight:
Python is lightweight.
Does it matter if something is considered by some dude on the internet wether it is lightweight or not? It's how that thing is utilised which will determine wether or not it is lightweight or heavy. Since Python can be used for both lightweight (http://balau82.wordpress.com/2010/06/28/simplest-rpg-game-in-python/ ) and heavy ( http://chandlerproject.org/ ) projects, it is my reason to believe that all your arguments are biased and subjective.