JSON格式添加\字符，当我追加文件，但不是输出字符串 [英] JSON formatting adding \ characters when I append file, but not to string in output

问题描述

我使用以下函数从flickr API 获取 json 。它返回的字符串是正确格式化的JSON块：

  def get_photo_data（photo_id）：
 para = {} 
 para [photo_id] = photo_id 
 para [method] =flickr.photos.getInfo
 para [format] =json
 para [ api_key] = FLICKR_KEY 
 request_data = params_unique_combination（https://api.flickr.com/services/rest/，para）
 
如果request_data在CACHE_DICTION中：
返回CACHE_DICTION [request_data] 
 else：
 response = requests.get（https://api.flickr.com/services/rest/，para）
 CACHE_DICTION [request_data] = response .text [14：-1] 
 cache_file = open（CACHE_FNAME，'w'）
 cache_file.write（json.dumps（CACHE_DICTION））
 cache_file.close（）
 return response.text [14：-1] 
  

我遇到的问题是当我去把json写入我的缓存文件，它会一直添加在反斜杠中，如下例所示：

https://api.flickr.com/services/rest/format-json_method-flickr.photos.getInfo_photo_id-34869402493：{\photo \ ：{\ id\ ：\ 34869402493\ \ secret\：\ 56fcf0342c\，\ server\：\ 4057\\ \\ \ farm\：5，\ dateuploaded\：\ 1499030213\，\ isfavorite\：0，\ license\：\ 0\ \ safety_level\：\ 0\，\ rotation\：0，\ originalsecret\：\ c4d1d316ed\，\ originalformat\ ：\ jpg\，\ owner\：{\ nsid\：\ 150544082 @ N05\，\ username\：\ ankitrana_，realname，Ankit Rana，location， \\ 4236\，\ iconfarm\：5，\ path_alias\：\ ankitrana_\}，\ title\：{\ _content\ ：\ 7\}，\description\\ ：{\ _content\ ：\ \ }，\ visibility\ ：{\ ispublic\ ：1，\ isfriend\：0，\ isfamily\：0}，\ dates\：{\ posted\：\ 1499030213\，\ taken\：\2017年6月19日13：43：38\，\ takengranularity\：\ 0\，\ takenunknown\：\ 0\，\ lastupdate\：\\ \\ 1499041020\}，\ views\：\ 41\，\ editability\：{\ cancomment\：0，\ canaddmeta\ ：0}，\ publiceditability\：{\ cancomment\：1，\ canaddmeta\：0}，\ usage\：{\ candownload\ ：1，\ canblog\：0，\ canprint\：0，\ canshare\：1}，\ comments\：{\ _content\ ：\ 0\}，\ notes\：{\ note\：[]}，\ people\：{\ haspeople\：0} ，\ tags\：{\ tag\：[{\ id\：\ 150538742-34869402493-5630\，\ author\：\ 150544082 @ N05\，\ authorname\：\ ankitrana_\，\ raw\：\ cincinnati\ \ _content\：\ cincinnati\，\ machine_tag\：0}，{\ id\：\ 150538742-34869402493-226\，\作者\ ：\ 150544082 @ N05\ \ authorname\：\ ankitrana_\，\ raw\：\ ohio\，\ _content \：\ohio \，\machine_tag\：false}，
...等等等等}

如何将JSON存储到现有文件中，而不使用这些额外的 \ 字符，如打印字符串时所表示的那样？使用 your_string.decode（'string_escape'）到unescape <$ c $ c $ \\ c

更新：

您的字符串因为 json.dumps（）而被转义，它将对象转换为字符串，之后您可以使用 json.loads（），结果是未转义的。

您可以使用 str（）

  cache_file.write（str（CACHE_DICTION））
＃{'myparam'：'162000，photo：...'
  

但是它保存到单引号文件的问题，它不是有效的JSON和不兼容 json。 （）

我的建议保持你的代码如上所述，除非你想把它存储到 CACHE_FNAME.json

  cache_file = open（CACHE_FNAME，'w'）
 cache_file.write（response .text）
 cache_file.close（）
＃{photos：{page：1，pages：6478，..} 
  

I am using the following function to get json from the flickr API. The string it returns is a properly formatted chunk of JSON:

def get_photo_data(photo_id):
    para = {}
    para["photo_id"] = photo_id
    para["method"] = "flickr.photos.getInfo"
    para["format"] = "json"
    para["api_key"] = FLICKR_KEY
    request_data = params_unique_combination("https://api.flickr.com/services/rest/", para)

    if request_data in CACHE_DICTION:
        return CACHE_DICTION[request_data]
    else:
        response = requests.get("https://api.flickr.com/services/rest/", para)
        CACHE_DICTION[request_data] = response.text[14:-1]
        cache_file = open(CACHE_FNAME, 'w')
        cache_file.write(json.dumps(CACHE_DICTION))
        cache_file.close()
        return response.text[14:-1]

The issue I am having is that when I go to write the json to my cache file it keeps adding in backslashes, like this example:

"https://api.flickr.com/services/rest/format-json_method-flickr.photos.getInfo_photo_id-34869402493": "{\"photo\":{\"id\":\"34869402493\",\"secret\":\"56fcf0342c\",\"server\":\"4057\",\"farm\":5,\"dateuploaded\":\"1499030213\",\"isfavorite\":0,\"license\":\"0\",\"safety_level\":\"0\",\"rotation\":0,\"originalsecret\":\"c4d1d316ed\",\"originalformat\":\"jpg\",\"owner\":{\"nsid\":\"150544082@N05\",\"username\":\"ankitrana_\",\"realname\":\"Ankit Rana\",\"location\":\"Cincinnati, USA\",\"iconserver\":\"4236\",\"iconfarm\":5,\"path_alias\":\"ankitrana_\"},\"title\":{\"_content\":\"7\"},\"description\":{\"_content\":\"\"},\"visibility\":{\"ispublic\":1,\"isfriend\":0,\"isfamily\":0},\"dates\":{\"posted\":\"1499030213\",\"taken\":\"2017-06-19 13:43:38\",\"takengranularity\":\"0\",\"takenunknown\":\"0\",\"lastupdate\":\"1499041020\"},\"views\":\"41\",\"editability\":{\"cancomment\":0,\"canaddmeta\":0},\"publiceditability\":{\"cancomment\":1,\"canaddmeta\":0},\"usage\":{\"candownload\":1,\"canblog\":0,\"canprint\":0,\"canshare\":1},\"comments\":{\"_content\":\"0\"},\"notes\":{\"note\":[]},\"people\":{\"haspeople\":0},\"tags\":{\"tag\":[{\"id\":\"150538742-34869402493-5630\",\"author\":\"150544082@N05\",\"authorname\":\"ankitrana_\",\"raw\":\"cincinnati\",\"_content\":\"cincinnati\",\"machine_tag\":0},{\"id\":\"150538742-34869402493-226\",\"author\":\"150544082@N05\",\"authorname\":\"ankitrana_\",\"raw\":\"ohio\",\"_content\":\"ohio\",\"machine_tag\":false}, ... etc., etc.}

How can I store the JSON to the existing file without these additional \ characters, as it is represented when I print the string?

解决方案

use your_string.decode('string_escape') to unescape \" to "

update:

your string escaped because json.dumps(), it convert object to string and later you can read it using json.loads(), the result are unescaped.

you can save it without slash using str()

cache_file.write(str(CACHE_DICTION))
# {'myparam' :'"162000","photo":...'

but the problem it save to file with single quotes, it not valid json and not compatible with json.loads()

my suggestion keep your code as above, except you want to store it to file CACHE_FNAME.json

cache_file = open(CACHE_FNAME, 'w')
cache_file.write(response.text)
cache_file.close()
# {"photos":{"page":1,"pages":6478,..}

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