map
Map能够处理集合按顺序遍历，最终将调用产生的结果保存在一个简单的集合当中。
# -*- coding: utf8 -*-
import os
import time
from multiprocessing import Pool
from PIL import Image
def create_thumbnail(filename, size=(128, 128)):
try:
fp, fmt = filename.rsplit('.', 1)
im = Image.open(filename)
im.thumbnail(size, Image.ANTIALIAS)
im.save((fp + '_'+'x'.join(str(i) for i in size) + '.'+fmt), im.format)
return '%s thumbnail success!' % filename
except Exception:
return '%s thumbnail failed!' % filename
def get_image_paths(folder):
return [os.path.join(folder, f) for f in os.listdir(folder) if 'png' in f]
def main():
filenames = get_image_paths('images')
start_time = time.time()
pool = Pool(4)
pool.map(create_thumbnail, filenames)
pool.close()
pool.join()
print time.time() - start_time
if __name__ == '__main__':
main()
