Python Guru needed

[Jim]

FC 10/KDE

I'm trying to set a simple Alarm Clock in FC10 and I have a Python 
script I picked up, but I have error, running the script.
Can you explain to me with # comments on each line how to make this work.

import time
import os

not_executed = 1

while(not_executed):
dt = list(time.localtime(time.time())
hour = dt[3]
minute = dt[4]
if hour == 5 and minute == 45:
os.popen2("open /Users/jun/shout.mp3")
not_executed = 0

Error Message;

$ python AlarmClock
  File "AlarmClock", line 7
    dt = list(time.localtime(time.time())
     ^
IndentationError: expected an indented block

Thanks  Jim