Related Articles

# Python Program to display keys with same values in a dictionary List

• Last Updated : 11 Dec, 2020

Given a list with all dictionary elements, the task is to write a Python program to extract keys having similar values across all dictionaries.

Examples:

Input : test_list = [{“Gfg”: 5, “is” : 8, “best” : 0}, {“Gfg”: 5, “is” : 1, “best” : 0}, {“Gfg”: 5, “is” : 0, “best” : 0}]
Output : [‘Gfg’, ‘best’]
Explanation : All Gfg values are 5 and best has 0 as all its values in all dictionaries.

Input : test_list = [{“Gfg”: 5, “is” : 8, “best” : 1}, {“Gfg”: 5, “is” : 1, “best” : 0}, {“Gfg”: 5, “is” : 0, “best” : 0}]
Output : [‘Gfg’]
Explanation : All Gfg values are 5.

Method 1 : Using keys() and loop

In this, we iterate through all the elements in the list using loop and extract keys using keys(). For each key, each dictionary’s key is compared, if found similar, key is added to result.

## Python3

 `# initializing Matrix``test_list ``=` `[{``"Gfg"``: ``5``, ``"is"``: ``8``, ``"best"``: ``0``},``             ``{``"Gfg"``: ``5``, ``"is"``: ``1``, ``"best"``: ``0``},``             ``{``"Gfg"``: ``5``, ``"is"``: ``0``, ``"best"``: ``0``}]`` ` `# printing original list``print``(``"The original list is : "` `+` `str``(test_list))`` ` `# getting keys``keys ``=` `list``(test_list[``0``].keys())`` ` `res ``=` `[]``# iterating each dictionary for similar key's value``for` `key ``in` `keys:``    ``flag ``=` `1``    ``for` `ele ``in` `test_list:`` ` `        ``# checking for similar values``        ``if` `test_list[``0``][key] !``=` `ele[key]:``            ``flag ``=` `0``            ``break`` ` `    ``if` `flag:``        ``res.append(key)`` ` `# printing result``print``(``"Similar values keys : "` `+` `str``(res))`

Output:

The original list is : [{‘Gfg’: 5, ‘is’: 8, ‘best’: 0}, {‘Gfg’: 5, ‘is’: 1, ‘best’: 0}, {‘Gfg’: 5, ‘is’: 0, ‘best’: 0}]

Similar values keys : [‘Gfg’, ‘best’]

Method 2 : Using all(), loop and keys()

In this, inner loop is avoided and replaced by all() which checks for all the keys having similar values and then the key is extracted.

## Python3

 `# initializing Matrix``test_list ``=` `[{``"Gfg"``: ``5``, ``"is"``: ``8``, ``"best"``: ``0``},``             ``{``"Gfg"``: ``5``, ``"is"``: ``1``, ``"best"``: ``0``},``             ``{``"Gfg"``: ``5``, ``"is"``: ``0``, ``"best"``: ``0``}]`` ` `# printing original list``print``(``"The original list is : "` `+` `str``(test_list))`` ` `# getting keys``keys ``=` `list``(test_list[``0``].keys())`` ` `res ``=` `[]`` ` `# iterating each dictionary for similar key's value``for` `key ``in` `keys:`` ` `    ``# using all to check all keys with similar values``    ``flag ``=` `all``(test_list[``0``][key] ``=``=` `ele[key] ``for` `ele ``in` `test_list)`` ` `    ``if` `flag:``        ``res.append(key)`` ` `# printing result``print``(``"Similar values keys : "` `+` `str``(res))`

Output:

The original list is : [{‘Gfg’: 5, ‘is’: 8, ‘best’: 0}, {‘Gfg’: 5, ‘is’: 1, ‘best’: 0}, {‘Gfg’: 5, ‘is’: 0, ‘best’: 0}]

Similar values keys : [‘Gfg’, ‘best’]

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