[Tutor] stop a loop after precise amount of time

[Saad Javed]

import time

s = time.time() + 30
running = True
while running:
if time.time() == s:
print 'yes'
running = False

This stops the loop after 30s but the program uses about 12% cpu. What
would be a more efficient way to do this? (p.s. i'm on python 2.7.3)

Saad
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