#  DotsAndDollars.py  Copyright (c) Kari Laitinen

#  http://www.naturalprogramming.com

#  2006-05-06  File created.
#  2022-12-18  Converted to Python 3.

#  Note that it may take 4 seconds before this program stops
#  after it has been ordered to stop.

#  With the sleep() function of the time module it is possible
#  to generate delays in a thread. The agrument that is given
#  to the sleep() function can be a floating-point number.

from threading import Thread
from time import sleep

class ThreadToPrintDots ( Thread ) :

   def __init__( self ) :

      Thread.__init__( self ) 
      self.must_print_dots  =  True

   def stop_this_thread( self ) :

      self.must_print_dots  =  False


   def run( self ) :

      while  self.must_print_dots  ==  True  :

         sleep( 1.000 )   # Wait one second.

         print( " ." )



class ThreadToPrintDollarSigns ( Thread ) :

   def __init__( self ) :

      Thread.__init__( self ) 
      self.must_print_dollar_signs  =  True

   def stop_this_thread( self ) :

      self.must_print_dollar_signs  =  False


   def run( self ) :

      while  self.must_print_dollar_signs  ==  True  :

         sleep( 4.050 )   # Wait 4.05 seconds.

         print( " $" )




thread_to_print_dots  =  ThreadToPrintDots()
thread_to_print_dollar_signs  =  ThreadToPrintDollarSigns()

thread_to_print_dots.start()
thread_to_print_dollar_signs.start()

print( "\n Press the Enter key to stop the program. \n\n" )

any_string_from_keyboard  =  input()

thread_to_print_dots.stop_this_thread()
thread_to_print_dollar_signs.stop_this_thread()