import os


def is_valid_jpg(jpg_file):
    with open(jpg_file, 'rb') as f:
        f.seek(-2, 2)
        buf = f.read()
        return buf ==  b'\xff\xd9'

def is_valid_png(png_file):
    with open(png_file, 'rb') as f:
        f.seek(-2, 2)
        buf = f.read()
        return buf == b'\x60\x82'

for dirPath, dirNames, fileNames in os.walk("D:\long\Desktop\image\\"):
    print (dirPath)
    path =(dirPath+"\\")
    for file in os.listdir(path):
        pic_file = path + file
        isJpg = is_valid_jpg(pic_file)
        isPng = is_valid_png(pic_file)
    print("jpeg : %s, png %s, file %s " % (isJpg, isPng, file))