[英][del]eting an item from a JSON dictionary leaves an empty dict: `{}`. How do I remove it completely?
I am trying to delete a dictionary item nested within a list, in a dict. 我正在尝试删除字典中嵌套在列表中的字典项。
After I del
the object, the modified dictionary will contain an empty dictionary: {}
in the place of the deleted object. 在
del
对象之后,修改后的字典将包含一个空字典: {}
代替删除的对象。
Here is the code I am using: 这是我正在使用的代码:
json_dict = {"top_key": "top_value", "bottom_key": [{"list_dict": "list_dict_value"},{"list_dict1": "list_dict_value1"}]}
print("initial:", json_dict)
def delete(list_dict):
for i in json_dict["bottom_key"]:
if list_dict in i:
del i[list_dict]
delete("list_dict")
print("final:", json_dict)
The final print will return: 最终打印将返回:
final: {'bottom_key': [{}, {'list_dict1': 'list_dict_value1'}], 'top_key': 'top_value'} (pw-retriever) simon@[pw-retriever](fix_del_ls)
I am trying to find a way to remove the {}
in addition to the key:value pair, in one go. 我正在尝试找到一种方法来一次性删除
{}
和key:value对。
edit: an explanation as to what the heck is going on would also be highly appreciated. 编辑:关于到底发生了什么的解释也将不胜感激。
You can do the following: 您可以执行以下操作:
for i in json_dict["bottom_key"][:]: # important: iterate a shallow copy
if list_dict in i:
json_dict["bottom_key"].remove(i)
However, since removing from a list is O(N)
and you might have to remove multiple elements, you might consider just rebuilding it from scratch in one go: 但是,由于从列表中删除是
O(N)
并且您可能必须删除多个元素,因此您可以考虑一次性从头开始重建它:
json_dict["bottom_key"] = [d for d in json_dict["bottom_key"] if list_dict not in d]
Constructing further on basis of your structure, del
using the index of the dict
, like follows : 根据您的结构进一步构建,使用
dict
的索引进行del
,如下所示:
def delete(list_dict):
for i,ele in enumerate(json_dict["bottom_key"][:]) :
if list_dict in ele:
del json_dict["bottom_key"][i]
#driver values : #driver值:
IN : initial: {'top_key': 'top_value', 'bottom_key': [{'list_dict': 'list_dict_value'}, {'list_dict1': 'list_dict_value1'}]}
>>> delete("list_dict")
OUT : final: {'top_key': 'top_value', 'bottom_key': [{'list_dict1': 'list_dict_value1'}]}
EDIT : schwobaseggl's idea of reconstructing the dictionary is better than deleting the elements as the previous one can lead to logical mistakes. 编辑: schwobaseggl重建字典的想法比删除元素更好,因为前一个元素会导致逻辑错误。
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