Where to place imports

[John [H2O]]

Hello, Im writing some modules and I am a little confused about where to
place my imports...

I don't really do any class programming yet, just defining a bunch of
functions, so presently I have something along the lines of:

import sys
import os
import traceback


def Foo1(a,b):
   import numpy
   import datetime
   return c

def Foo2(a,b):
   import datetime

   c = Foo1(a,b)
   return c

etc...

Above obviously just for the form, but the point is, in some cases I may
import modules twice, but other times I may not use them at all, so should I
import everything into the main module? Or individually import them into
functions. Is there a performance penalty either way? 

Pointers to a good reference are appreciated...


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