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Python – Smallest K values in Dictionary

  • Last Updated : 17 Dec, 2019

Many times while working with Python dictionary, we can have a particular problem to find the K minima of values in numerous keys. This problem is quite common while working with web development domain. Let’s discuss several ways in which this task can be performed.

Method #1 : itemgetter() + items() + sorted()
The combination of above method is used to perform this particular task. In this, we just sort the dictionary values expressed using itemgetter() and accessed using items().




# Python3 code to demonstrate working of
# Smallest K values in Dictionary
# Using sorted() + itemgetter() + items()
from operator import itemgetter
  
# Initialize dictionary
test_dict = {'gfg' : 1, 'is' : 4, 'best' : 6, 'for' : 7, 'geeks' : 3 }
  
# Initialize K 
K = 2
  
# printing original dictionary
print("The original dictionary is : " + str(test_dict))
  
# Smallest K values in Dictionary
# Using sorted() + itemgetter() + items()
res = dict(sorted(test_dict.items(), key = itemgetter(1))[:K])
  
# printing result
print("The minimum K value pairs are " + str(res))
Output :
The original dictionary is : {'geeks': 3, 'is': 4, 'for': 7, 'best': 6, 'gfg': 1}
The minimum K value pairs are {'geeks': 3, 'gfg': 1}

 

Method #2 : Using nsmallest()
This task can be performed using the nsmallest function. This is inbuilt function in heapq library which internally performs this task and can be used to do it externally. Has the drawback of printing just keys not values.






# Python3 code to demonstrate working of
# Smallest K values in Dictionary
# Using nsmallest
from heapq import nsmallest
  
# Initialize dictionary
test_dict = {'gfg' : 1, 'is' : 4, 'best' : 6, 'for' : 7, 'geeks' : 3 }
  
# Initialize K
K = 2
  
# printing original dictionary
print("The original dictionary is : " + str(test_dict))
  
# Smallest K values in Dictionary
# Using nsmallest
res = nsmallest(K, test_dict, key = test_dict.get)
  
# printing result
print("The minimum K value pairs are " + str(res))
Output :
The original dictionary is : {'geeks': 3, 'best': 6, 'is': 4, 'gfg': 1, 'for': 7}
The minimum K value pairs are ['gfg', 'geeks']

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