批量修改图片名称 python

def rename():
    path = "./2/"
    filelist = os.listdir(path)
    total_num = len(filelist)
    i = 1
    for item in filelist:
        if item.endswith('.png'):
            old = os.path.join(os.path.abspath(path), item)
            print('src', src)
            new = os.path.join(os.path.abspath('./1/'), '' + str(i) + '.png') 
            print('dst', dst)
            try:
                # src:原名称  dst新名称
                os.rename(old, new)  
                i += 1
            except:
                continue