Python - Remove keys with Values Greater than K ( Including mixed values )

Python – Remove keys with Values Greater than K ( Including mixed values )

Last Updated : 29 Aug, 2020

Given a dictionary with key-value pairs, remove all the keys with values greater than K, including mixed values.

Input : test_dict = {‘Gfg’ : 3, ‘is’ : 7, ‘best’ : 10, ‘for’ : 6, ‘geeks’ : ‘CS’}, K = 7
Output : {‘Gfg’ : 3, ‘for’ : 6, ‘geeks’ : ‘CS’}
Explanation : All values greater than K are removed. Mixed value is retained.
Input : test_dict = {‘Gfg’ : 3, ‘is’ : 7, ‘best’ : 10, ‘for’ : 6, ‘geeks’ : ‘CS’}, K = 1
Output : {‘geeks’ : ‘CS’}
Explanation : Only Mixed value is retained.

Method #1 : Using isinstance() + loop

This is one of the ways in which this task can be performed. In this, we use instance to get integral values and and comparisons to get values not greater than K.

Python3

# Python3 code to demonstrate working of 
# Remove keys with Values Greater than K ( Including mixed values )
# Using loop + isinstance()
  
# initializing dictionary
test_dict = {'Gfg' : 3, 'is' : 7, 'best' : 10, 'for' : 6, 'geeks' : 'CS'} 
  
# printing original dictionary
print("The original dictionary is : " + str(test_dict))
  
# initializing K 
K = 6
  
# using loop to iterate keys of dictionary
res = {}
for key in test_dict:
    
    # testing for data type and then condition, order is imp.
    if not (isinstance(test_dict[key], int) and test_dict[key] > K):
        res[key] = test_dict[key]
          
# printing result 
print("The constructed dictionary : " + str(res)) 

Output

The original dictionary is : {'Gfg': 3, 'is': 7, 'best': 10, 'for': 6, 'geeks': 'CS'}
The constructed dictionary : {'Gfg': 3, 'for': 6, 'geeks': 'CS'}

Method #2 : Using dictionary comprehension + isinstance()

The combination of above functions is used to solve this problem. This performs task similar to above method. The only difference being that it performs in one liner using dictionary comprehension.

Python3

# Python3 code to demonstrate working of 
# Remove keys with Values Greater than K ( Including mixed values )
# Using dictionary comprehension + isinstance()
  
# initializing dictionary
test_dict = {'Gfg' : 3, 'is' : 7, 'best' : 10, 'for' : 6, 'geeks' : 'CS'} 
  
# printing original dictionary
print("The original dictionary is : " + str(test_dict))
  
# initializing K 
K = 6
  
# using list comprehension to perform in one line
res = {key : val for key, val in test_dict.items() if not (isinstance(val, int) and (val > K))}
          
# printing result 
print("The constructed dictionary : " + str(res)) 

Output

The original dictionary is : {'Gfg': 3, 'is': 7, 'best': 10, 'for': 6, 'geeks': 'CS'}
The constructed dictionary : {'Gfg': 3, 'for': 6, 'geeks': 'CS'}

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