在 Python 的嵌套字典中更新计数器
[英]Updating counters in a nested dictionary in Python
问题描述
I am using an empty results dictionary with initial values 0 which I would like to update upon occurrence once going through my source data.
我正在使用一个初始值为 0 的空结果字典，一旦通过我的源数据，我想在出现时对其进行更新。 The Dictionary looks like this:字典看起来像这样：
{
"Group1": {
"1": {
"fr": {
"answered": 0,
"unanswered": 0
},
"nl": {
"answered": 0,
"unanswered": 0
},
"not_specified": {
"answered": 0,
"unanswered": 0
}
},
"2": {
"fr": {
"answered": 0,
"unanswered": 0
},
"nl": {
"answered": 0,
"unanswered": 0
},
"not_specified": {
"answered": 0,
"unanswered": 0
}
},
"3": {
"fr": {
"answered": 0,
"unanswered": 0
},
"nl": {
"answered": 0,
"unanswered": 0
},
"not_specified": {
"answered": 0,
"unanswered": 0
}
},
"4": {
"fr": {
"answered": 0,
"unanswered": 0
},
"nl": {
"answered": 0,
"unanswered": 0
},
"not_specified": {
"answered": 0,
"unanswered": 0
}
},
"5": {
"fr": {
"answered": 0,
"unanswered": 0
},
"nl": {
"answered": 0,
"unanswered": 0
},
"not_specified": {
"answered": 0,
"unanswered": 0
}
},
"6": {
"fr": {
"answered": 0,
"unanswered": 0
},
"nl": {
"answered": 0,
"unanswered": 0
},
"not_specified": {
"answered": 0,
"unanswered": 0
}
},
"not_specified": {
"fr": {
"answered": 0,
"unanswered": 0
},
"nl": {
"answered": 0,
"unanswered": 0
},
"not_specified": {
"answered": 0,
"unanswered": 0
}
}
},
"Group2": {
"1": {
"fr": {
"answered": 0,
"unanswered": 0
},
"nl": {
"answered": 0,
"unanswered": 0
},
"not_specified": {
"answered": 0,
"unanswered": 0
}
},
"2": {
"fr": {
"answered": 0,
"unanswered": 0
},
"nl": {
"answered": 0,
"unanswered": 0
},
"not_specified": {
"answered": 0,
"unanswered": 0
}
},
"3": {
"fr": {
"answered": 0,
"unanswered": 0
},
"nl": {
"answered": 0,
"unanswered": 0
},
"not_specified": {
"answered": 0,
"unanswered": 0
}
},
"4": {
"fr": {
"answered": 0,
"unanswered": 0
},
"nl": {
"answered": 0,
"unanswered": 0
},
"not_specified": {
"answered": 0,
"unanswered": 0
}
},
"5": {
"fr": {
"answered": 0,
"unanswered": 0
},
"nl": {
"answered": 0,
"unanswered": 0
},
"not_specified": {
"answered": 0,
"unanswered": 0
}
},
"6": {
"fr": {
"answered": 0,
"unanswered": 0
},
"nl": {
"answered": 0,
"unanswered": 0
},
"not_specified": {
"answered": 0,
"unanswered": 0
}
},
"not_specified": {
"fr": {
"answered": 0,
"unanswered": 0
},
"nl": {
"answered": 0,
"unanswered": 0
},
"not_specified": {
"answered": 0,
"unanswered": 0
}
}
}
}dic
When I try to update just a given counter though like:当我尝试仅更新给定的计数器时，例如：
myDic['Group1']['1']['nl']['answered']=myDic['Group1']['1']['nl']['answered']+10
myDic['Group2']['1']['nl']['answered']=myDic['Group2']['1']['nl']['unanswered']+100
I get absolutely all counters updated in the whole dictionary with the same values.我得到了在整个字典中使用相同值更新的所有计数器。 What is the reason for that?这是什么原因？
1 个解决方案
解决方案1
1 2021-04-07 12:22:07
Your current code is valid, but looks like your {"answered": 0, "unanswered": 0} dict is a reference to the same object, so when you've change the value in one it changes everywhere.您当前的代码是有效的，但看起来您的{"answered": 0, "unanswered": 0} dict 是对同一个 object 的引用，因此当您更改其中的值时，它会随处更改。
Check if id(myDic['Group1']['1']['nl']) == id(myDic['Group1']['1']['fr']) ?检查id(myDic['Group1']['1']['nl']) == id(myDic['Group1']['1']['fr'])是否？ If so, you need to use from copy import deepcopy when created these dicts.如果是这样，您需要在创建这些字典时使用from copy import deepcopy 。
This code smells but makes clear overview:这段代码有异味，但可以清楚地概述：
from copy import deepcopy
original = deepcopy(myDic['Group1']['1']['nl'])
original['answered'] += 10
myDic['Group1']['1']['nl'] = original
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