List comprehension, map-filter, custom loop, generator

filtermap.py

from random import choice
from operator import methodcaller


l = []
for i in range(1000):
    l.append(choice(['1', '10', '', ' ']))


def mapfilt(xs):
    """ Test map-filter. """
    return filter(bool, map(methodcaller('strip'), xs))


def listcomp(xs):
    """ Test list comprehension. """
    return [x.strip() for x in xs if x.strip()]


def gen(xs):
    def f(xs):
        for x in xs:
            y = x.strip()
            if y:
                yield y
    return list(f(xs))


def loop(xs):
    """ Test append loop. """
    ys = []
    for x in xs:
        y = x.strip()
        if y:
            ys.append(y)
    return ys

results.sh

dmedvinsky at zeus in ~
><((°> python2 -mtimeit -s'import filtermap' 'filtermap.loop(filtermap.l)'
1000 loops, best of 3: 265 usec per loop

dmedvinsky at zeus in ~
><((°> python2 -mtimeit -s'import filtermap' 'filtermap.listcomp(filtermap.l)'
1000 loops, best of 3: 221 usec per loop

dmedvinsky at zeus in ~
><((°> python2 -mtimeit -s'import filtermap' 'filtermap.gen(filtermap.l)'
1000 loops, best of 3: 209 usec per loop

dmedvinsky at zeus in ~
><((°> python2 -mtimeit -s'import filtermap' 'filtermap.mapfilt(filtermap.l)'
10000 loops, best of 3: 172 usec per loop