quick hack for timing import speed

gistfile1.txt

# To measure cold-cache import speed:
#  $ echo 3 > /proc/sys/vm/drop_caches
#  >>> timeimport("mymod", 1)
#
# To measure hot-cache import speed:
#  >>> timeimport("mymod", 1)  # warm the cache
#  >>> timeimport("mymod", 10) # make the measurement

import sys
import timeit
def timeimport(modname, N=50):
    orig_mods = set(sys.modules)
    def cleanimport():
        __import__(modname)
        for mod in list(sys.modules):
            if mod not in orig_mods:
                del sys.modules[mod]
    return timeit.timeit(cleanimport, number=N) * 1. / N