在django中图片上传的格式校验及大小方法

Uploadfiles = request.FILES.get('参数'， '')   for i in Uploadfiles :    # 图片大小的属性 i.size     suffix = os.path.splitext(i.name)[1]    if not suffix:     return False    elif suffix.lower() == '.jpeg' or suffix.lower() == ".png" or suffix.lower() == ".jpg":      pass    else:     return False    im = Image.open(i)    if im.format == 'JPEG' or im.format == "PNG":     pass    else:     return False   return True