Skip to content
Related Articles
Python – Remove K value items from dictionary nesting
• Last Updated : 01 Aug, 2020

Given dictionary with multiple nestings, remove all the keys with value K.

Input : [{“Gfg” : {“a” : 5, “b” : 8, “c” : 9}}, {“is” : {“j” : 8, “k” : 10}}, {“Best” : {“i” : 16}}], K = 8
Output : [{‘a’: 5}, {‘c’: 9}, {‘k’: 10}, {‘i’: 16}]
Explanation : All the keys with value 8, (“b”, “j”) has been removed.

Input : [{“Gfg” : {“a” : 5, “b” : 8, “c” : 9}}, {“is” : {“j” : 8, “k” : 10}}, {“Best” : {“i” : 16}}], K = 5
Output : [{‘c’: 9}, {‘k’: 10}, {‘i’: 16}, {“j” : 8}, {“b” : 8}]
Explanation : “a” with 5 as value removed.

Method #1 : Using loop + dictionary comprehension

The combination of above functions can be used to solve this problem. In this, we iterate for all the nesting keys using loop. and remove values. This approach is for single level nesting of dictionary.

## Python3

 `# Python3 code to demonstrate working of ``# Remove K value items from dictionary nestings``# Using dictionary comprehension + loop`` ` `# initializing list``test_list ``=` `[{``"Gfg"` `: {``"a"` `: ``5``, ``"b"` `: ``8``, ``"c"` `: ``9``}},``             ``{``"is"` `: {``"f"` `: ``8``, ``"j"` `: ``8``, ``"k"` `: ``10``}},``             ``{``"Best"` `: {``"i"` `: ``16``}}]`` ` `# printing original list``print``(``"The original list is : "` `+` `str``(test_list))`` ` `# initializing K ``K ``=` `8`` ` `res ``=` `list``()`` ` `for` `sub ``in` `test_list:``    ``for` `key, val ``in` `sub.items():``         ` `        ``# iterating for 1st nesting only``        ``for` `key1, val1 ``in` `val.items():``            ``if` `val1 !``=` `K:``                ``res.append({key1 : val1})`` ` `# printing result ``print``(``"The dictionary after value removal : "` `+` `str``(res)) `
Output

The original list is : [{‘Gfg’: {‘a’: 5, ‘b’: 8, ‘c’: 9}}, {‘is’: {‘f’: 8, ‘j’: 8, ‘k’: 10}}, {‘Best’: {‘i’: 16}}]
The dictionary after value removal : [{‘a’: 5}, {‘c’: 9}, {‘k’: 10}, {‘i’: 16}]

Method #2 : Using recursion + loop (For multiple nesting)

This is yet another way in which this task can be performed. In this we solve a more generic problem of catering to inner dictionary elements as well using recursion.

## Python3

 `# Python3 code to demonstrate working of ``# Remove K value items from dictionary nestings``# Using recursion + loop (For multiple nesting)`` ` `res ``=` `[]`` ` `# helper function to solve problem``def` `hlper_fnc(test_dict):``    ``for` `key ``in` `test_dict:``        ``if` `type``(test_dict[key]) ``=``=` `dict``:``            ``hlper_fnc(test_dict[key])``        ``else``:``            ``if` `test_dict[key] !``=` `K:``                ``res.append({key : test_dict[key]})`` ` `# initializing dictionary``test_dict ``=` `{``"Gfg"` `: {``"a"` `: ``5``, ``"b"` `: ``8``, ``"c"` `: ``9``},``             ``"is"` `: {``"f"` `: ``8``, ``"l"` `: { ``"j"` `: ``8``, ``"k"` `: ``10``}},``             ``"Best"` `: {``"i"` `: {``"k"` `: { ``"o"` `: ``8``}}}}`` ` `# printing original dictionary``print``(``"The original dictionary is : "` `+` `str``(test_dict))`` ` `# initializing K ``K ``=` `8`` ` `# computing result``hlper_fnc(test_dict)`` ` `# printing result ``print``(``"The dictionary after value removal : "` `+` `str``(res)) `
Output

The original dictionary is : {‘Gfg’: {‘a’: 5, ‘b’: 8, ‘c’: 9}, ‘is’: {‘f’: 8, ‘l’: {‘j’: 8, ‘k’: 10}}, ‘Best’: {‘i’: {‘k’: {‘o’: 8}}}}
The dictionary after value removal : [{‘a’: 5}, {‘c’: 9}, {‘k’: 10}]

Attention geek! Strengthen your foundations with the Python Programming Foundation Course and learn the basics.

To begin with, your interview preparations Enhance your Data Structures concepts with the Python DS Course. And to begin with your Machine Learning Journey, join the Machine Learning – Basic Level Course

My Personal Notes arrow_drop_up