## Lecture 3 - Functions ##
# Michelle Szucs

# To download as a Python file, right-click the link
# and select "Save link as..."

# Modified from Lecture 2:
def getAges(): # This function doesn't take any arguments
    myAge = int(raw_input("What is your age? "))
    friendAge = int(raw_input("What is your friend's age? "))
    # We want to return both values, so we're going to
    # put them in a tuple.
    # Note: The parentheses aren't necessary -
    # return myAge, friendAge would also work,
    # but I wanted to emphasize that it's a tuple.
    return (myAge, friendAge)


########## Lecture 3 Code ############

def getBirthYear(age):
    # This print statement will execute because it's
    # before the return statement
    print 75 
    return 2013 - age
    # This print statement WON'T execute because it's
    # after the return statement
    print 50

# This function is for you to use to understand the
# difference between print and return
def printBirthYear(age):
    print 2013 - age
    # Remember that since I don't have a return statement,
    # Python inserts an implicit return None

# This next line is called "unpacking the tuple" -
# we're assigning the values contained in the tuple
# returned by getAges() to two seperate variables
myAge, friendAge = getAges()
birthYear = getBirthYear(myAge)
friendBirthYear = getBirthYear(friendAge)
print "In 2050 you'll be", 2050 - birthYear
print "Your friend was born in", friendBirthYear