Move more code out of mathics.builtin.__init__

[rocky]

Moved to mathics.eval.builtin. Possibly not the best place, but it is better and is a start.

[mmatera]

LGTM.

My only comment is that I think it mathics.core.builtins would be a better place than mathics.eval.builtin for the code used to load builtins.

My guess is that at some point mathics.core.builtin namespace should contain only subclasses of Builtin that define built in symbols, and the loading mechanisms should be in the "core" of the library. But this is something we can discuss later: the split proposed here seems a good starting point.

[rocky]

LGTM.

My only comment is that I think it mathics.core.builtins would be a better place than mathics.eval.builtin for the code used to load builtins.

My guess is that at some point mathics.core.builtin namespace should contain only subclasses of Builtin that define built in symbols, and the loading mechanisms should be in the "core" of the library. But this is something we can discuss later: the split proposed here seems a good starting point.

I had been thinking about this too, and I think mathics.core is better.

The bigger picture here is that I'd like to be able speed up initial startup time by loading only a minimal set of built in modules, and have the others load as they get called. In GNU Emacs this is called autoloading.

[mmatera]

@rocky, thanks. Merge this when you feel it is ready.