解決圖片對象不能json序列化問題：<ImageFieldFile: image/background_IXSZChD.jpg> is not JSON serializable

json.dumps（img_list，）不可以序列化圖片，不知道怎麼回事（py3）報錯：

Traceback (most recent call last):
  File "/home/python35/lib/python3.5/site-packages/django/core/handlers/exception.py", line 41, in inner
    response = get_response(request)
  File "/home/python35/lib/python3.5/site-packages/django/core/handlers/base.py", line 187, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/home/python35/lib/python3.5/site-packages/django/core/handlers/base.py", line 185, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/home/q10/myProject/userManage/tempManage.py", line 55, in useImg
    return HttpResponse(json.dumps(img_list,sort_keys=True),content_type="application/json")
  File "/home/python35/lib/python3.5/json/__init__.py", line 237, in dumps
    **kw).encode(obj)
  File "/home/python35/lib/python3.5/json/encoder.py", line 198, in encode
    chunks = self.iterencode(o, _one_shot=True)
  File "/home/python35/lib/python3.5/json/encoder.py", line 256, in iterencode
    return _iterencode(o, 0)
  File "/home/python35/lib/python3.5/json/encoder.py", line 179, in default
    raise TypeError(repr(o) + " is not JSON serializable")
TypeError: <ImageFieldFile: image/background_IXSZChD.jpg> is not JSON serializable
[15/Nov/2017 16:08:18] "POST /useImg/ HTTP/1.1" 500 14696
Performing system checks...

原代碼：

img_list.append({"id":i.id,"img":i.img,"name":i.img_name,"user":i.img_user.user_nickname})
        return HttpResponse(json.dumps(img_list,sort_keys=True),content_type="application/json")

查了下是img對象沒有被json序列化，要str（img對象）纔可以，：

修正後：

img_list.append({"id":i.id,"img":str(i.img),"name":i.img_name,"user":i.img_user.user_nickname})
        return HttpResponse(json.dumps(img_list,sort_keys=True),content_type="application/json")

區別在於

"img":str(i.img)

，加了str（）轉換 就ok了，