Python | Check for None values in given dictionary

Many times, while working with dictionaries, we wish to check for a non-null dictionary, i.e check for None values in given dictionary. This finds application in Machine Learning in which we have to feed data with no none values. Let’s discuss certain ways in which this task can be performed.

Method #1 : Using all() + not operator + values()

The combination of above functions can be used to perform this particular task. In this, we check for all the values using all function extracted using values function. The not operator is used to inverse the result to check for any of None value.

# Python3 code to demonstrate working of 
# Check for Non None Dictionary values 
# Using all() + not operator + values() 
  
# initializing dictionary 
test_dict = {'Gfg' : 1, 'for' : 2, 'CS' : None} 
  
# printing original dictionary 
print("The original dictionary is : " + str(test_dict)) 
  
# Using all() + not operator + values() 
# Check for Non None Dictionary values 
res = not all(test_dict.values()) 
  
# printing result  
print("Does Dictionary contain None value ? " + str(res)) 

Output :

The original dictionary is : {'Gfg': 1, 'CS': None, 'for': 2}
Does Dictionary contain None value ? True

Method #2 : Using in operator + values()

This task can also be performed using the in operator and values function. We just check for None in all the values extracted using the values function and check for existence using the in operator.

# Python3 code to demonstrate working of 
# Check for Non None Dictionary values 
# Using in operator + values() 
  
# initializing dictionary 
test_dict = {'Gfg' : 1, 'for' : 2, 'CS' : None} 
  
# printing original dictionary 
print("The original dictionary is : " + str(test_dict)) 
  
# Using in operator + values() 
# Check for Non None Dictionary values 
res = None in test_dict.values() 
  
# printing result  
print("Does Dictionary contain None value ? " + str(res)) 

Output :

The original dictionary is : {'Gfg': 1, 'CS': None, 'for': 2}
Does Dictionary contain None value ? True

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