text: #! /usr/bin/env python
  
  # Calculate your unbirthday count (see Alice in Wonderland).
  # This is defined as the number of days from your birth until today
  # that weren't your birthday.  (The day you were born is not counted).
  # Leap years make it interesting.
  
  import sys
  import time
  import calendar
  
  def raw_input(prompt):
      sys.stdout.write(prompt)
      sys.stdout.flush()
      return sys.stdin.readline()
  
  def main():
      # Note that the range checks below also check for bad types,
      # e.g. 3.14 or ().  However syntactically invalid replies
      # will raise an exception.
      if sys.argv[1:]:
          year = int(sys.argv[1])
      else:
          year = int(input('In which year were you born? '))
      if 0<=year<100:
          print("I'll assume that by", year, end=' ')
          year = year + 1900
          print('you mean', year, 'and not the early Christian era')
      elif not (1850<=year<=2002):
          print("It's hard to believe you were born in", year)
          return
      #
      if sys.argv[2:]:
          month = int(sys.argv[2])
      else:
          month = int(input('And in which month? (1-12) '))
      if not (1<=month<=12):
          print('There is no month numbered', month)
          return
      #
      if sys.argv[3:]:
          day = int(sys.argv[3])
      else:
          day = int(input('And on what day of that month? (1-31) '))
      if month == 2 and calendar.isleap(year):
          maxday = 29
      else:
          maxday = calendar.mdays[month]
      if not (1<=day<=maxday):
          print('There are no', day, 'days in that month!')
          return
      #
      bdaytuple = (year, month, day)
      bdaydate = mkdate(bdaytuple)
      print('You were born on', format(bdaytuple))
      #
      todaytuple = time.localtime()[:3]
      todaydate = mkdate(todaytuple)
      print('Today is', format(todaytuple))
      #
      if bdaytuple > todaytuple:
          print('You are a time traveler.  Go back to the future!')
          return
      #
      if bdaytuple == todaytuple:
          print('You were born today.  Have a nice life!')
          return
      #
      days = todaydate - bdaydate
      print('You have lived', days, 'days')
      #
      age = 0
      for y in range(year, todaytuple[0] + 1):
          if bdaytuple < (y, month, day) <= todaytuple:
              age = age + 1
      #
      print('You are', age, 'years old')
      #
      if todaytuple[1:] == bdaytuple[1:]:
          print('Congratulations!  Today is your', nth(age), 'birthday')
          print('Yesterday was your', end=' ')
      else:
          print('Today is your', end=' ')
      print(nth(days - age), 'unbirthday')
  
  def format(xxx_todo_changeme):
      (year, month, day) = xxx_todo_changeme
      return '%d %s %d' % (day, calendar.month_name[month], year)
  
  def nth(n):
      if n == 1: return '1st'
      if n == 2: return '2nd'
      if n == 3: return '3rd'
      return '%dth' % n
  
  def mkdate(xxx_todo_changeme1):
      # Januari 1st, in 0 A.D. is arbitrarily defined to be day 1,
      # even though that day never actually existed and the calendar
      # was different then...
      (year, month, day) = xxx_todo_changeme1
      days = year*365                 # years, roughly
      days = days + (year+3)//4        # plus leap years, roughly
      days = days - (year+99)//100     # minus non-leap years every century
      days = days + (year+399)//400    # plus leap years every 4 centirues
      for i in range(1, month):
          if i == 2 and calendar.isleap(year):
              days = days + 29
          else:
              days = days + calendar.mdays[i]
      days = days + day
      return days
  
  if __name__ == "__main__":
      main()
  