Python

• Every file of Python source code that ends in .py is a module - no special code or naming is required.
• dir fetches all names available inside a module: dir(modname)
• Each file is a self-contained namespace.
• reloads are not transitive, so reloading module A which imports module B does not reload B.
• To run a script: exec(open('script.py').read())

Links

• Learning Python - From the author of Learning Python and Programming Python.