A bit of apple & oranges going on here because you don't need Moose (or more precisely Class::MOP) to simulate Python metaclasses and descriptors. Because you

A bit of apple & oranges going on here because you don't need Moose (or more precisely Class::MOP) to simulate Python metaclasses and descriptors. Because you could, if you so wished, build a Python metaclasse/descriptor based OO system in Perl's native OO. To clarify things: * Python comes with a pre-defined OO system with metaclasses/descriptors for dynamically building new Python classes/objects. * Perl comes with OO lego blocks from which you build you own OO system. * Class::MOP is a metacircular MOP mainly written in Perl using these lego blocks (it's turtles all the way down). * A MOP (like Class::MOP) provide an API for building & managing extendable OO systems. * Moose is an advanced OO system built on Class::MOP. * Moose provides features like Roles, Method Modifiers, lazy attributes and many more. There have been two attempts, that I know of, to bring (a subset of) Moose to Python: https://pypi.python.org/pypi/bullwinkle/0.3.6 https://pypi.python.org/pypi/elk/0.2 There have been many clones of Moose to other languages as well, including Ruby (multiple clones/ports), Javascript & Lua. For something comparable to Moose/Class::MOP then have a look at CLOS (Lisp).