text: Organizing files in Sage Cloud/modules
  I am working in sage cloud, in a worksheet (sagews). I wrote some classes and methods so far and I wish to keep them separated from my new code/organize my projects in files that I can import from.
  I want something like
  file Resources.(.py? .sage? .sagews?) with classes Foo, Foo2, Foo3
  and to use this in a new spreadsheet:
  from Resources import Foo2
  While this seems like a basic question, the only thing I could discover on this topic was a similar unanswered question:...
  How do I do this? How do I split a project in several files(modules?) that I could import from?