> Perl has reader macros and a meta-object protocol upon the object system is built with. More specifically, Perl has advanced features with which meta-object

> Perl has reader macros and a meta-object protocol upon the object system is built with. More specifically, Perl has advanced features with which meta-object protocols can be built with. See Class::MOP on which Moose is built. > That is an example of what the OP is saying with Perl is an extensible language. I think the difficulty with Ruby and Python is that both are fully object-oriented, which means it is difficult to create something that is truly orthogonal to the object model.