hour=0 for i in range(0,24): minu=0 for j in range(0,60): sec=0 for k in range(0,60): milsec=0 for m in range(0,200): print(str(hour)+":"+str(minu)+":"+str(sec)+":"+str(milsec)) milsec+=1 sec=sec+1 minu=minu+1 hour=hour+1