"""
 A class example of functions:
 the "happy birthday song"
"""

first_line = "hi there"

def happy_birthday(name):
  """ Input:  a person's name.
      Output: the happy birthday song as a string. """
  first_line = "Happy Birthday to you"
  song = first_line + ",\n" + \
         first_line + ",\n" + \
         "Happy Birthday dear " + name + ",\n" + \
         first_line + "!\n"
  return song

def main():
  print happy_birthday("Peter")
  print
  print happy_birthday("Mary")
  print
  print "first_line is " + first_line

main()