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’]

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