examples/os/sleep.py
from __future__ import print_function
import time

start = time.time()
print("hello " + str(start))
time.sleep(3.5)
end = time.time()
print("world " + str(end))
print("Elapsed time:" + str(end-start))
hello 1475217162.472256
world 1475217165.973437
Elapsed time:3.501181125640869