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Python – Common list elements and dictionary values

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  • Last Updated : 17 Jun, 2021

Given list and dictionary, extract common elements of List and Dictionary Values.

Input : test_list = [“Gfg”, “is”, “Best”, “For”], subs_dict = {4 : “Gfg”, 8 : “Geeks”, 9 : ” Good”, } 
Output : [‘Gfg’] 
Explanation : “Gfg” is common in both list and dictionary value.
Input : test_list = [“Gfg”, “is”, “Best”, “For”, “Geeks”], subs_dict = {4 : “Gfg”, 8 : “Geeks”, 9 : ” Best”, } 
Output : [‘Gfg’, “Geeks”, “Best”] 
Explanation : 3 common values are extracted. 
 

Method #1 : Using list comprehension + values()

 The combination of above functionalities provide a way in which this task can be performed in a single line. In this, we  extract values of dictionaries using values() and list comprehension is used to perform iteration and intersection checks.

Python3




# Python3 code to demonstrate working of
# List elements and dictionary values intersection
# Using list comprehension + values()
 
# initializing list
test_list = ["Gfg", "is", "Best", "For", "Geeks"]
 
# printing original list
print("The original list : " + str(test_list))
 
# initializing subs. Dictionary
subs_dict = {4 : "Gfg", 8 : "Geeks", 9 : " Good", }
 
# Intersection of elements, using "in" for checking presence
res = [ele for ele in test_list if ele in subs_dict.values()]
         
# printing result
print("Intersection elements : " + str(res))

Output

The original list : ['Gfg', 'is', 'Best', 'For', 'Geeks']
Intersection elements : ['Gfg', 'Geeks']

Method #2 :  Using set() + intersection()

In this approach both list and dictionary values are converted to set() and then intersection is performed to get common elements.

Python3




# Python3 code to demonstrate working of
# Common list elements and dictionary values
# Using set() and intersection()
 
# initializing list
test_list = ["Gfg", "is", "Best", "For", "Geeks"]
 
# printing original list
print("The original list : " + str(test_list))
 
# initializing subs. Dictionary
subs_dict = {4 : "Gfg", 8 : "Geeks", 9 : " Good", }
 
# Intersection of elements, using set() to convert
# intersection() for common elements
res = list(set(test_list).intersection(list(subs_dict.values())))
         
# printing result
print("Intersection elements : " + str(res))

Output

The original list : ['Gfg', 'is', 'Best', 'For', 'Geeks']
Intersection elements : ['Geeks', 'Gfg']

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