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import os
def pic(file_dir):
filenames = os.listdir(file_dir)
flag = 0
for files in filenames:
img = Image.open(file_dir+'/'+files)
img.thumbnail((500,500))
img.save('img/'+files+'.jpg','JPEG',quality=90)将file_dir文件夹下的图片压缩并存入img文件夹中