Best practices with import?

[Alex]

Goodness, without import, python's close to useless.  There's usually a
module that does something related to whatever you're trying to do, and
you can often save yourself a lot of effort by using such modules.

I'm not sure what advantage there might be to deleting module references
in a function's scope just prior to leaving it.  I would have thought
the reference was usually dropped at that point, anyway.

Alex.