python多线程生成缩略图

在img目录下7张图片

分别是

　　11.jpg 22.jpg 33.jpg 44.jpg 55.jpg 66.jpg 77.jpg

#encoding=utf-8
import os
import time
from multiprocessing.dummy import Pool as ThreadPool
from PIL import Image

SIZE = (75,75)
SAVE_DIRECTORY = 'thumbs'

def get_image_paths(folder):
return(os.path.join(folder,f) for f in os.listdir(folder) if '.jpg' in f)

def create_thumbnail(filename):
im = Image.open(filename)
im.thumbnail(SIZE, Image.ANTIALIAS)
base, fname = os.path.split(filename)
save_path = os.path.join(base, SAVE_DIRECTORY, fname)
im.save(save_path)

if __name__ == '__main__':

start = time.time()
folder = os.path.abspath('img')
if not os.path.exists(os.path.join(folder,SAVE_DIRECTORY)):
os.mkdir(os.path.join(folder,SAVE_DIRECTORY))

images = get_image_paths(folder)
pool = ThreadPool()
pool.map(create_thumbnail,images)
pool.close()
pool.join()
end = time.time()
print(end-start)

在对应的文件下会创建thumbs 缩略图文件，然后

生成对应的缩略图，执行时间为：

0.109212875366