Functions

#Use def to "define" a function.  Below we are telling python to def the
#function "is_it_even".  Functions are followed by an optional argument, in
#the case below, I am using the "x" as a placeholder for that argument.
#It takes the value of "x" and passes it into the function.  Inside the
#function it runs the code against the argument of "x", checking to see if x
#is divisble by 2.

def is_it_even(x):
    if x % 2 == 0:
        return True
    else:
        return False

# here we are going to "call" the function by printing its name and giving it
# an argument for "x".

print is_it_even(8)
print is_it_even(9)




# Most functions are used for bigger and better things than checking for even
# numbers. Often they are used inside other objects called Classes.  These
# classes are the foundation of most extensive programs. When functions are used
# inside a Class they are referred to as methods.