Python | Check if given multiple keys exist in a dictionary

A dictionary in Python consists of a collection of key-value pairs. Each key-value pair maps the key to its associated value.

Input : dict[] = {“geeksforgeeks” : 1, “practice” : 2, “contribute” :3}
keys[] = {“geeksforgeeks”, “practice”}
Output : Yes

Input : dict[] = {“geeksforgeeks” : 1, “practice” : 2, “contribute” :3}
keys[] = {“geeksforgeeks”, “ide”}
Output : No

Let’s discuss various ways of checking multiple keys in a dictionary :

Method #1 Using comparison operator :
This is the common method where we make a set which contain keys that use to compare and using comparison operator we check if that key present in our dictionary or not.



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# Python3 code to check multiple key existence
# using comparison operator
  
# initializing a dictionary
sports = {"geeksforgeeks" : 1, "practice" : 2, "contribute" :3}
  
# using comparison operator
print(sports.keys() >= {"geeksforgeeks", "practice"})
print(sports.keys() >= {"contribute", "ide"})

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Output:


True
False







Method #3 Using issubset() :

In this method, we will check the keys that we have to compare is subset() of keys in our dictionary or not.













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# Python3 code heck multiple key existence 


# using issubset 


  


# initializing a dictionary 


sports = {"geeksforgeeks" : 1, "practice" : 2, "contribute" :3} 


  


# creating set of keys that we want to compare 


s1 = set(['geeksforgeeks', 'practice']) 


s2 = set(['geeksforgeeks', 'ide']) 


  


print(s1.issubset(sports.keys())) 


print(s2.issubset(sports.keys())) 



















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Output:


True
False







Method #4 Using if and all statement :

In this method we will check that if all the key elements that we want to compare are present in our dictionary or not .













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# Python3 code check multiple key existence 


# using if and all 


  


# initializing a dictionary 


sports = {"geeksforgeeks" : 1, "practice" : 2, "contribute" :3} 


  


# using if, all statement  


if all(key in sports for key in ('geeksforgeeks', 'practice')): 


    print("keys are present") 


else: 


    print("keys are not present") 


  


# using if, all statement  


if all(key in sports for key in ('geeksforgeeks', 'ide')): 


    print("keys are present") 


else: 


    print("keys are not present") 



















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Output:


keys are present
keys are not present






          
          
          
          

            

    

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