使用 Python 的 JSON 数据中的空值，而不是无值
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Nulls, instead of Nones, in JSON Data with Python
提问by Daniel
I'm working with the following data:
我正在处理以下数据：
[{"title": null, "metric1": 361429, "metric2": 36,},{"title": null, "metric1": 253798, "metric2": 48}]
When I attempt to assign this data to a variable in Python (with the aim of parsing it out), I receive the following error message:
当我尝试将此数据分配给 Python 中的变量时（目的是将其解析），我收到以下错误消息：
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name 'null' is not defined
From my research, it appears that the Noneis Python's null. What I'm wondering is, is it possible to change the null's in my data to None's using Python?
从我的研究来看，似乎None是 Python 的null. 我想知道的是，是否可以使用 Python 将null数据中的None's更改为's ？
I've tried creating a string out of the data, assigning it to data, and replacing the null's that way:
我已经尝试从数据中创建一个字符串，将其分配给data，并以null这种方式替换's：
data = data.replace('null','None')
but that results in a string of the data itself:
但这会产生一串数据本身：
data = '[{"title": None, "metric1": 361429, "metric2": 36,},{"title": None, "metric1": 253798, "metric2": 48}]'
and I can't figure out how to turn it from a string back into JSON.
我不知道如何将它从字符串转换回 JSON。
EDIT: I am copying and pasting this data into the Python interpreter from a separate source.
编辑：我正在将此数据从单独的源复制并粘贴到 Python 解释器中。
采纳答案by Oliver W.
Much simpler!
简单多了！
Just assign Noneto nullbefore assigning that list to a variable:
刚分配None来null分配该列表的变量之前：
null = None
var = [{"title": null, "metric1": 361429, "metric2": 36,},{"title": null, "metric1": 253798, "metric2": 48}]
Then you won't need to do the rather unnecessary conversion to a string (and back to a Python object with json.loads) only to replace nullby None.
然后，您将不需要对字符串（并返回到带有 的 Python 对象json.loads）进行相当不必要的转换，只需将 替换null为None。
But that is only really necessary if you're copy-pasting that code from some source. Otherwise, the canonical answer is to use json.loads(or json.load).
但是，只有当您从某个来源复制粘贴该代码时，这才是真正必要的。否则，规范的答案是使用json.loads(或json.load)。
回答by levi
As is mentioned above, you don't need to replace "null"for "None"
如上所述，您不需要替换"null"为"None"
Just
只是
import json
parsed_data = json.loads(data)
