title: Importing Modules - How Much is Too Much?
body: <p>As a newbie, I've grown fond of importing modules almost by default when I start writing something just because I call on certain functions within them quite a bit (modules like random, time, os, and sys).  However, does this impact performance at all?  If I only want a specific function in the module, am I better served by asking for it explicitly or should I not care?</p>