new_contents: #!/usr/bin/env python
  import time
  from datetime import datetime, timedelta
  from time import sleep
  
  SECONDS_PER_DAY = 24 * 60 * 60
  
  
  def doFunc():
      print "do Function..."
  
  
  def doFirst():
      curTime = datetime.now()
      print curTime
      desTime = curTime.replace(hour=20, minute=0, second=0, microsecond=0)
      print desTime
      delta = desTime-curTime
      sleeptime = delta.total_seconds()
      print "Now day must sleep %d seconds" %     sleeptime
      sleep(sleeptime)
      doFunc()
  
  
  if __name__ == "__main__":
      doFirst()
  
subject: Create backup_db.py