Updating an Imported Function

[Donovan Parks]

Hello,

I'm new to Python and have what is probably a very basic question. I
am writing a helloWorld() function within a file called helloWorld.py:

def helloWorld():
	print 'hi'

Now, I can import and run this function:

import helloWorld
helloWorld.helloWorld()

Which will print 'hi' as expected. Now, I'd like to update this
function in my text editor so it is:

def helloWorld():
	print 'hello world'

Without having to exit my Python interpreter, how can I import this
revised function? If I do the import again:

import helloWorld

And run helloWorld.helloWorld() it will still print out just 'hi'.
I've tried deleting this function (a weird concept to me as I come
from a C++ background) using del helloWorld and than importing again,
but the function will still print out just 'hi'.

Can this be done? How so?

Thanks for any and all help.

Cheers,
Donovan