It's how the majority of the stdlib is written. Construction of objects with the stdlib is pretty limited to things that allocate os resources (files, sockets,

It's how the majority of the stdlib is written. Construction of objects with the stdlib is pretty limited to things that allocate os resources (files, sockets, etc with obvious state full ness and destruction behavior) unless you're already operating on objects (dict views, iterators). The exceptions are those which were ported (unittest was a clone of java 's framework incl method names).