Defining Functions

>>> def add2nums(x, y):
... 	return x + y
... 
>>> result = add2nums(1, 1)
>>> print result
2
>>> # an example with default arguments
... 
>>> def sayhi(greeting = "hello, world"):
... 	print greeting
... 
>>> sayhi("hello from python!")
hello from python!
>>> sayhi()
hello, world