如何将字典转储到json文件?

2020/10/31 13:03 · python ·  · 0评论

我有这样的命令:

sample = {'ObjectInterpolator': 1629,  'PointInterpolator': 1675, 'RectangleInterpolator': 2042}

我不知道如何将字典转储到json文件,如下所示:

{      
    "name": "interpolator",
    "children": [
      {"name": "ObjectInterpolator", "size": 1629},
      {"name": "PointInterpolator", "size": 1675},
      {"name": "RectangleInterpolator", "size": 2042}
     ]
}

有python方式可以做到这一点吗?

您可能会猜到我想生成一个d3树形图。

import json
with open('result.json', 'w') as fp:
    json.dump(sample, fp)

这是一种更简单的方法。

在第二行代码中,result.json将创建文件并将其作为变量打开fp

在第三行中,您的字典sample被写入result.json

结合@mgilson和@gnibbler的答案,我发现我需要的是:


d = {"name":"interpolator",
     "children":[{'name':key,"size":value} for key,value in sample.items()]}
j = json.dumps(d, indent=4)
f = open('sample.json', 'w')
print >> f, j
f.close()

It this way, I got a pretty-print json file.
The tricks print >> f, j is found from here:
http://www.anthonydebarros.com/2012/03/11/generate-json-from-sql-using-python/

d = {"name":"interpolator",
     "children":[{'name':key,"size":value} for key,value in sample.items()]}
json_string = json.dumps(d)

Of course, it's unlikely that the order will be exactly preserved ... But that's just the nature of dictionaries ...

这应该给你一个开始

>>> import json
>>> print json.dumps([{'name': k, 'size': v} for k,v in sample.items()], indent=4)
[
    {
        "name": "PointInterpolator",
        "size": 1675
    },
    {
        "name": "ObjectInterpolator",
        "size": 1629
    },
    {
        "name": "RectangleInterpolator",
        "size": 2042
    }
]

具有漂亮的打印格式:

import json

with open(path_to_file, 'w') as file:
    json_string = json.dumps(sample, default=lambda o: o.__dict__, sort_keys=True, indent=2)
    file.write(json_string)

也想添加它(Python 3.7)

import json

with open("dict_to_json_textfile.txt", 'w') as fout:
    json_dumps_str = json.dumps(a_dictionary, indent=4)
    print(json_dumps_str, file=fout)

If you're using Path:

example_path = Path('/tmp/test.json')
example_dict = {'x': 24, 'y': 25}
json_str = json.dumps(example_dict, indent=4) + '\n'
example_path.write_text(json_str, encoding='utf-8')
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