import os import time def print_ts(message):     print "[%s] %s"%(time.strftime("%Y-%m-%d %H:%M:%S", time.localtime()), message) def run(interval, command):     print_ts("-"*100)     print_ts("Command %s"%command)     print_ts("Starting every %s seconds."%interval)     print_ts("-"*100)     while True:         try:             # sleep for the remaining seconds of interval             time_remaining = interval-time.time()%interval             print_ts("Sleeping until %s (%s seconds)..."%((time.ctime(time.time()+time_remaining)), time_remaining))             time.sleep(time_remaining)             print_ts("Starting command.")             # execute the command             status = os.system(command)             print_ts("-"*100)             print_ts("Command status = %s."%status)         except Exception, e:             print e if __name__=="__main__":     interval = 5     command = r"ipconfig"     run(interval, command)