Python program to find the highest 3 values in a dictionary

Dictionary in Python is an unordered collection of data values, used to store data values like a map, which unlike other Data Types that hold only single value as an element, Dictionary holds key:value pair.

Examples:

Input : my_dict = {'A': 67, 'B': 23, 'C': 45,
                   'D': 56, 'E': 12, 'F': 69} 

Output : {'F': 69, 'A': 67, 'D': 56}

Let us see different methods we can find the highest 3 values in a dictionary. 

Method #1: Using collections.Counter()

A Counter is a dict subclass for counting hashable objects. It is an unordered collection where elements are stored as dictionary keys and their counts are stored as dictionary values. Counts are allowed to be any integer value including zero or negative counts. The Counter class is similar to bags or multisets in other languages.

most_common([n]) returns a list of the n most common elements and their counts from the most common to the least. 

Python3

# Python program to demonstrate
# finding 3 highest values in a Dictionary

from collections import Counter

# Initial Dictionary
my_dict = {'A': 67, 'B': 23, 'C': 45,
           'D': 56, 'E': 12, 'F': 69}

k = Counter(my_dict)

# Finding 3 highest values
high = k.most_common(3)

print("Initial Dictionary:")
print(my_dict, "\n")


print("Dictionary with 3 highest values:")
print("Keys: Values")

for i in high:
    print(i[0]," :",i[1]," ")

Output:

Initial Dictionary:
{'C': 45, 'B': 23, 'D': 56, 'A': 67, 'E': 12, 'F': 69} 

Dictionary with 3 highest values:
Keys: Values
F  : 69  
A  : 67  
D  : 56

Method #2: Using heapq.nlargest()

Python3

# Python program to demonstrate
# finding 3 highest values in a Dictionary
from heapq import nlargest

# Initial Dictionary
my_dict = {'A': 67, 'B': 23, 'C': 45,
           'D': 56, 'E': 12, 'F': 69}

print("Initial Dictionary:")
print(my_dict, "\n")

ThreeHighest = nlargest(3, my_dict, key = my_dict.get)

print("Dictionary with 3 highest values:")
print("Keys: Values")

for val in ThreeHighest:
    print(val, ":", my_dict.get(val))

Output:

Initial Dictionary:
{'D': 56, 'E': 12, 'F': 69, 'C': 45, 'B': 23, 'A': 67} 

Dictionary with 3 highest values:
Keys: Values
F : 69
A : 67
D : 56

Method #3: Using keys(),values() and sort() methods

Python3

# Python program to demonstrate
# finding 3 highest values in a Dictionary

# Initial Dictionary
my_dict = {'A': 67, 'B': 23, 'C': 45,
        'D': 56, 'E': 12, 'F': 69}

print("Initial Dictionary:")
print(my_dict, "\n")

print("Dictionary with 3 highest values:")
print("Keys: Values")

x=list(my_dict.values())
d=dict()
x.sort(reverse=True)
x=x[:3]
for i in x:
    for j in my_dict.keys():
        if(my_dict[j]==i):
            print(str(j)+" : "+str(my_dict[j]))

Output

Initial Dictionary:
{'A': 67, 'B': 23, 'C': 45, 'D': 56, 'E': 12, 'F': 69} 

Dictionary with 3 highest values:
Keys: Values
F : 69
A : 67
D : 56