python更改图片后缀名为jpg格式

import os
import cv2
class GeneDataset():
    def __init__(self,rootdir):
        self.rootdir = rootdir
        self.subdirs = []
    def looksubdir(self):
        list_dirs = os.walk(self.rootdir)
        for root, dirs, files in list_dirs:
            for d in dirs:
                self.subdirs.append(os.path.join(root, d))
                print("subdir =", os.path.join(root, d))
    def reformat(self):14         for subdir in self.subdirs:
            list_dirs = os.walk(subdir)
            for root, dirs, files in list_dirs:
                for f in files:
                    srcname = os.path.join(root, f)
                    print('srcname', srcname)
                    srcformat = srcname.split('.')[-1]
                    if srcformat is not '.jpg':
                        img = cv2.imread(srcname)
                        newname = srcname.replace(srcformat, 'jpg')
                        print('newname=', newname)
                        cv2.imwrite(newname, img)
                        os.remove(srcname)
path = r'E:\data\pic'
myclassdataset = GeneDataset(path)
myclassdataset.looksubdir()
myclassdataset.reformat()