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