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Python – Remove duplicate values across Dictionary Values
• Last Updated : 10 May, 2020

Sometimes, while working with Python dictionaries, we can have a problem in which we need to remove all the duplicate values across all the dictionary value lists. This problem can have application in data domains and web development domains. Let’s discuss certain ways in which this task can be performed.

Input : test_dict = {‘Manjeet’: [1], ‘Akash’: [1, 8, 9]}
Output : {‘Manjeet’: [], ‘Akash’: [8, 9]}

Input : test_dict = {‘Manjeet’: [1, 1, 1], ‘Akash’: [1, 1, 1]}
Output : {‘Manjeet’: [], ‘Akash’: []}

Method #1 : Using `Counter()` + list comprehension
The combination of above functions can be used to solve this problem. In this, we use Counter() to extract all frequencies and list comprehension to assign the value with single occurrence in value list.

 `# Python3 code to demonstrate working of ``# Remove duplicate values across Dictionary Values``# Using Counter() + list comprehension``from` `collections ``import` `Counter`` ` `# initializing dictionary``test_dict ``=` `{``'Manjeet'` `: [``1``, ``4``, ``5``, ``6``],``            ``'Akash'` `: [``1``, ``8``, ``9``],``            ``'Nikhil'``: [``10``, ``22``, ``4``],``            ``'Akshat'``: [``5``, ``11``, ``22``]}`` ` `# printing original dictionary``print``(``"The original dictionary : "` `+` `str``(test_dict))`` ` `# Remove duplicate values across Dictionary Values``# Using Counter() + list comprehension``cnt ``=` `Counter()``for` `idx ``in` `test_dict.values():``    ``cnt.update(idx)``res ``=` `{idx: [key ``for` `key ``in` `j ``if` `cnt[key] ``=``=` `1``] ``               ``for` `idx, j ``in` `test_dict.items()}`` ` `# printing result ``print``(``"Uncommon elements records : "` `+` `str``(res)) `
Output :

The original dictionary : {‘Akshat’: [5, 11, 22], ‘Nikhil’: [10, 22, 4], ‘Manjeet’: [1, 4, 5, 6], ‘Akash’: [1, 8, 9]}
Uncommon elements records : {‘Akshat’: [11], ‘Nikhil’: [10], ‘Manjeet’: [6], ‘Akash’: [8, 9]}

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