What is the difference between import modx and from modx import *?

If a defines a.b and a.c...

import a
a.b()
a.c()

vs.

from a import b
b()
c() # fails because c isn't imported

vs.

from a import *
b()
c()

Note that from foo import * is generally frowned upon since:

1. It puts things into the global namespace without giving you fine control
2. It can cause collisions, due to everything being in the global namespace
3. It makes it unclear what is actually defined in the current file, since the list of what it defines can vary depending on what's imported.