python_functions.py

print
def hello():
    print 'Hello!'
 
def area_rectangle(width, height):
    return width * height

def area_square(side):
    return side*side

def area_circle(radius):
    return 3.14* radius ** 2
 
def print_welcome(name):
    print 'Welcome,', name


def print_options():
    print " 'r' get area of a rectangle"
    print " 's' get area of a square"
    print " 'c' get area of a circle"
    print " 'q' quit"

def get_choice():
    option = 'p'

    while option != 'q':
        if option == 'r':
            print_rectangle()
        elif option == 's':
            print_square()
        elif option == 'c':
            print_circle()

        print_options()
        option = raw_input("option: ")
        
def print_rectangle():
    print
    print 'To find the area of a rectangle,'
    print 'enter the width and height below.'
    print

    w = input('Width: ')
    while w <= 0:
        print 'Must be a positive number'
        w = input('Width: ')
 
    h = input('Height: ')
    while h <= 0:
        print 'Must be a positive number'
        h = input('Height: ')
     
    print 'Width =', w, 'Height =', h, 'so Area =', area_rectangle(w, h)

def print_square():
    print
    print 'To find the area of a square,'
    print 'enter the length of a side below.'
    print

    w = input('Side: ')
    while w <= 0:
            print 'Must be a positive number'
            w = input('Side: ')
 
    print 'Side =', w, 'so Area =', area_square(w)  

def print_circle():
    print
    print 'To find the area of a circle,'
    print 'enter the length of the radius below.'
    print

    w = input('Radius: ')
    while w <= 0:
            print 'Must be a positive number'
            w = input('Radius: ')
 
    print 'Radius =', w, 'so Area =', area_circle(w)


name = raw_input('Your Name: ')
hello(),
print_welcome(name)
get_choice()