JSON格式在我附加文件时添加字符，但不是输出中的字符串 [英] JSON formatting adding characters when I append file, but not to string in output

问题描述

我正在使用以下函数从 flickr API 获取 json.它返回的字符串是格式正确的 JSON 块:

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]

我遇到的问题是，当我将 json 写入缓存文件时，它会不断添加反斜杠，例如以下示例:

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":"美国辛辛那提","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},"用法":{"candownload":1,"canblog":0,"canprint":0,"canshare":1},"comments":{"_content":"0"},"notes":{"note":[]},"people":{"haspeople":0},"tags":{"tag":[{"id":"150538742-34869402493-5630","作者":"150544082@N05","作者名":"ankitrana_","raw":"cincinnati","_content":"cincinnati","machine_tag":0},{"id":"150538742-34869402493-226","作者":"150544082@N05","作者名":"ankitrana_","raw":"ohio","_content":"ohio","machine_tag":false},...等等等等}

如何在没有这些额外的 字符的情况下将 JSON 存储到现有文件中，就像我打印字符串时所表示的那样?

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

推荐答案

使用 your_string.decode('string_escape') 将 " 转义为 "

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

更新:

你的字符串转义是因为 json.dumps()，它将对象转换为字符串，然后你可以使用 json.loads() 读取它，结果未转义.

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

你可以使用 str() 保存它而不使用斜线

you can save it without slash using str()

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

但是它用单引号保存到文件的问题，它不是有效的 json 并且与 json.loads()

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

我的建议保持您的代码如上，除非您想将其存储到文件 CACHE_FNAME.json

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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