time.sleep

• 1). Import the "time" module with the command "import time."
  
  
• 2). Use the command "time.sleep(2)" to delay the execution of the program for 2 seconds.
  
  
• 3). Delay for shorter periods of time using decimal numbers. For example, use "time.sleep(.005)" to delay for 5 milliseconds. This delay is not reliably precise, however, because other threads besides Python's may be running.
  
  
• 4). Call a function immediately after the "time.sleep" command to run it after the delay.
  
  

scheduler object

• 1). Import the "time" and "sched" modules with the command "import time,sched."
  
  
• 2). Create a scheduler object with a command like "schedule = sched.scheduler(time.time,time.sleep)." The two arguments are a function that returns the current time and one that causes a delay. You can use other functions besides the "time" module's, for example, if you are creating a simulation that implements its own time variable.
  
  
• 3). Add a function to the scheduler with a command like "schedule.enter(2,1,print,'0')." The "print" function is scheduled to run 2 seconds after this command is executed, with the argument '0.' The second argument ('1') is the priority of this event, which will be weighed against other events in the scheduler.
  
  
• 4). Start the scheduler with the command "schedule.run()." Note that each event's delay is relative to when "enter" is called, not when "run" is called.
  
  

Timer object

• 1). Import the "threading" module with the command "import threading."
  
  
• 2). Create a new Timer object with a command like "timer = threading.Timer(5,print,'0')." The format is the same as the "enter" function in the "sched" module, but it has no priority argument.
  
  
• 3). Start the timer with the command "timer.start()." The delay begins on this command. Other commands may be executed before the Timer finishes waiting.