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 contains keys that use to compare and using comparison operator we check if that key present in our dictionary or not.

# 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"}) 

Output:

True
False

Method #2 Using issubset() :
In this method, we will check the keys that we have to compare is subset() of keys in our dictionary or not.

# 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())) 

Output:

True
False

Method #3 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 .

# 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") 

Output:

keys are present
keys are not present

My Personal Notes

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