[英]Removing nested keys in Python dictionary
I have a dictionary that looks like this: 我有一本字典,看起来像这样:
data = {'a1': {'version': '1',
'results': {'key':'value'}
},
'a2': {'version': '1',
'results': {'key':'value'}
}
}
I need to get rid of the key 'version' and have the output like this: 我需要摆脱关键的“版本”,并获得如下输出:
{'a1': {'results': {'key':'value'}},
'a2': {'results': {'key':'value'}},
...
I got the code: 我得到了代码:
data2 = {}
for k, v in data:
if k == 'version':
data2[k] = None
However, this returns an empty dictionary. 但是,这将返回一个空字典。
What would be a proper code to achieve this? 什么是实现这一目标的合适代码?
data = {'a1': {'version': '1',
'results': {'key':'value'}
},
'a2': {'version': '1',
'results': {'key':'value'}
}
}
for inner_dict_key in data:
if 'version' in data[inner_dict_key]:
del data[inner_dict_key]['version']
Result: 结果:
{'a1': {'results': {'key': 'value'}}, 'a2': {'results': {'key': 'value'}}}
Python 3: Python 3:
data2 = {k: {'results': v['results']} for k, v in data.items()}
Python 2: Python 2:
replace items
with iteritems
更换items
与iteritems
Explanation: 说明:
.items()
gives us an iterator over (key, value) pairs .items()
为我们提供了对(键,值)对的迭代器
You can do this with a nested dict comprehension 您可以通过嵌套的dict理解来做到这一点
data2 = {k: {k: v for k, v in v.items() if k != 'version'} for k, v in data.items()}
If you are confused by the scope of the k's and v's you can label the ones from the inner dict 如果您对k和v的范围感到困惑,则可以从内部dict标记它们
data2 = {k: {k1: v1 for k1, v1 in v.items() if k1 != 'version'} for k, v in data.items()}
Making new dicts from comprehensions prevents accidental side-effects to dict
as seen in the answers using del
从内涵作出新的类型的字典,防止意外的副作用,以dict
为使用的答案看出del
This worked: 这工作:
data2 = data.copy()
for k in data:
if 'version' in data[k]:
del data2[k]['version']
print(data2)
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