benchmark

import timeit as     _timeit
from math import sqrt as _sqrt

def timer_test(s_processing, s_pretreatment, repeat=100):
    """
    print minimam, max, average, and unbiased of spend times.
    """
    t     = _timeit.Timer(s_processing, s_pretreatment)
    times = t.repeat(repeat)
    l     = len(times)

    ave = sum(times)/len(times)
    m   = min(times)
    M   = max(times)
    variance = _sqrt(sum([(time - ave)*(time-ave) for time in times])/(len(times)-1))
    
    out = ''
    out += 'average: {}\n'.format(ave)
    out += 'min    : {}\n'.format(m)
    out += 'max    : {}\n'.format(M)
    out += 'unbiased variance: {}'.format(variance)
    print(out)

if __name__ == '__main__':
    s_processing   = 'math.sin(10)'
    s_pretreatment = 'import math'
    test(s_processing, s_pretreatment)