In python for series 60, the use of e32.ao_sleep is encourage over time.sleep. AO stands for 'Active Object' approach to cooperative multi-tasking. When an object go to 'ao_sleep' other active objects can run.
import e32 e32.ao_sleep(5) # sleep for 5 seconds
There is another usage ao_sleep(interval, callback) where ao_sleep will return immediately but the callback will be called after the interval (in another thread?) This could be used to create a repeat loop for every interval. I show this in <a href=http://bigbold.com/snippets/posts/show/730>a previous snippet</a>.
import e32, time def showtime(): print time.clock() e32.ao_sleep(1, showtime) # sleep then call itself again showtime() # start the loop