使用json解析空字符串 [英] parse empty string using json

问题描述

我想知道是否有一种方法可以使用json.loads来自动将空字符串转换为其他内容，例如None.

I was wondering if there was a way to use json.loads in order to automatically convert an empty string in something else, such as None.

例如，给定:

data = json.loads('{"foo":"5", "bar":""}')

我想拥有:

data = {"foo":"5", "bar":None}

代替:

data = {"foo":"5", "bar":""}

推荐答案

您可以使用字典理解:

data = json.loads('{"foo":"5", "bar":""}')
res = {k: v if v != '' else None for k, v in data.items()}

{'foo': '5', 'bar': None}

这只会处理嵌套字典的第一级.您可以使用递归函数来处理更广义的嵌套字典情况:

This will only deal with the first level of a nested dictionary. You can use a recursive function to deal with the more generalised nested dictionary case:

def updater(d, inval, outval):
    for k, v in d.items():
        if isinstance(v, dict):
            updater(d[k], inval, outval)
        else:
            if v == '':
                d[k] = None
    return d

data = json.loads('{"foo":"5", "bar":"", "nested": {"test": "", "test2": "5"}}')

res = updater(data, '', None)

{'foo': '5', 'bar': None,
 'nested': {'test': None, 'test2': '5'}}

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