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Python | Check if dictionary is empty

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  • Difficulty Level : Basic
  • Last Updated : 22 May, 2019

Sometimes, we need to check if a particular dictionary is empty or not. And this particular task has its application in web development domain in which we sometimes need to test for results of a particular query or check whether we have any key to add info into database. Let’s discuss certain ways in which this task can be performed.

Method #1 : Using bool()

The bool function can be used to perform this particular task. As name suggests it performs the task of converting an object to a boolean value, but here, passing an empty string returns a False, as failure to convert something that is empty.




# Python3 code to demonstrate
# Check if dictionary is empty
# using bool()
  
# initializing empty dictionary
test_dict = {}
  
# printing original dictionary
print("The original dictionary : " + str(test_dict))
  
# using bool()
# Check if dictionary is empty 
res = not bool(test_dict)
  
# print result
print("Is dictionary empty ? : " + str(res))


Output :

The original dictionary : {}
Is dictionary empty ? : True

 

Method #2 : Using not operator

This task can also be performed using the not operator that checks for a dictionary existence, this evaluates to True, if any key in the dictionary is not found.




# Python3 code to demonstrate
# Check if dictionary is empty
# using not operator
  
# initializing empty dictionary
test_dict = {}
  
# printing original dictionary
print("The original dictionary : " + str(test_dict))
  
# using not operator
# Check if dictionary is empty 
res = not test_dict
  
# print result
print("Is dictionary empty ? : " + str(res))


Output :

The original dictionary : {}
Is dictionary empty ? : True

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