Modifying Global Variables from Within a Function

[Josh Tomkins]

Hello Everyone!

This is, perhaps, a newbie type of question (I am new to Python), but
here goes: 

Can you modify a global variable from inside a function?  Basically what
I want to do is this: 

a = 0 #global variable

def func1(None):
    	a = 5 #or whatever
    	return

def func2(None):
    	#do stuff here
    	func1(None)
    	#do more stuff with the newly modified a
    	return

this is a contrived example.  In reality, I will need to modify several
variables, changing them to zero.  Is this possible? 

Thanks,

Josue