Python | Test if key exists in tuple keys dictionary

Sometimes, while working with dictionary data, we need to check if a particular key is present in dictionary. If keys are elementary, the solution of problem in discussed and easier to solve. But sometimes, we can have tuple as key of dictionary. Let’s discuss certain ways in which this task can be performed.

Method #1 : Using any() + generator expression

Combination of above functionalities can be used to perform this task. In this, we check for each element inside each key for the target key. The any() is used to check in any keys of dictionary.



filter_none

edit
close

play_arrow

link
brightness_4
code

# Python3 code to demonstrate working of
# Test if key exists in tuple keys dictionary
# using any() + generator expression
  
# initialize dictionary
test_dict = {(4, 5) : '1', (8, 9) : '2', (10, 11) : '3'}
  
# printing original dictionary
print("The original dictionary : " + str(test_dict))
  
# Test key 
key = 10
  
# Test if key exists in tuple keys dictionary
# using any() + generator expression
res = any(key in sub for sub in test_dict)
  
# printing result
print("Does key exists in dictionary? : " + str(res))

chevron_right






                        filter_none









Output :          


The original dictionary : {(4, 5): '1', (8, 9): '2', (10, 11): '3'}
Does key exists in dictionary? : True





 


Method #2 : Using from_iterable()


This task can also be performed using this function. In this, we flatten the keys and then check for existence.











                                    filter_none




                                    edit

                                    close




                                    play_arrow




                                    link

                                    brightness_4

                                    code
                                




















# Python3 code to demonstrate working of 


# Test if key exists in tuple keys dictionary 


# using from_iterable() 


from itertools import chain 


  


# initialize dictionary 


test_dict = {(4, 5) : '1', (8, 9) : '2', (10, 11) : '3'} 


  


# printing original dictionary 


print("The original dictionary : " + str(test_dict)) 


  


# Test key  


key = 10


  


# Test if key exists in tuple keys dictionary 


# using from_iterable() 


res = key in chain.from_iterable(test_dict) 


  


# printing result 


print("Does key exists in dictionary? : " + str(res)) 



















                        chevron_right







                        filter_none









Output :          


The original dictionary : {(4, 5): '1', (8, 9): '2', (10, 11): '3'}
Does key exists in dictionary? : True








    

        My Personal Notes
        arrow_drop_up
    

    

        
        

            
            
        

    


Recommended Posts:
manjeet_04
Check out this Author's contributed articles.
If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.
Please Improve this article if you find anything incorrect by clicking on  the "Improve Article" button below.