It's comparing apples to oranges.
Python's great strength is that its standard library is huge. Just about
anything can be done very easily in Python. And then, there are a ton of
third-party libraries offering even more functionality. Basically, Python
makes doing complex things much easier.
Lua, on the other hand, is extremely light and has flexible syntax.
I think Lua is an amazing language as an extension language. Something for
adding stuff on to a primarily C-based (or C++-based) codebase. See Naev and
Minetest, for example. Python, on the other hand, is much better as a primary
language.
