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Python program to find the sum of dictionary keys
  • Last Updated : 01 Oct, 2020

Given a dictionary with integer keys. The task is to find the sum of all the keys.

Examples:

Input : test_dict = {3 : 4, 9 : 10, 15 : 10, 5 : 7} 
Output : 32 
Explanation : 3 + 9 + 15 + 5 = 32, sum of keys.

Input : test_dict = {3 : 4, 9 : 10, 15 : 10} 
Output : 27 
Explanation : 3 + 9 + 15 = 27, sum of keys. 

Method #1: Using loop

This is one of the ways in which this task can be performed. In this, we iterate all the keys in the dictionary and compute summation using a counter.

Python3




# Python3 code to demonstrate working of
# Dictionary Keys Summation
# Using loop
  
# initializing dictionary
test_dict = {3: 4, 9: 10, 15: 10, 5: 7, 6: 7}
  
# printing original dictionary
print("The original dictionary is : " + str(test_dict))
  
res = 0
for key in test_dict:
  
    # adding keys
    res += key
  
# printing result
print("The dictionary keys summation : " + str(res))
Output



The original dictionary is : {3: 4, 9: 10, 15: 10, 5: 7, 6: 7}
The dictionary keys summation : 38

Method #2 : Using keys() + sum()

This is shorthand with the help of which this task can be performed. In this, we extract all keys in list using keys(), and the summation is performed using sum().

Python3




# Python3 code to demonstrate working of
# Dictionary Keys Summation
# Using keys() + sum()
  
# initializing dictionary
test_dict = {3: 4, 9: 10, 15: 10, 5: 7, 6: 7}
  
# printing original dictionary
print("The original dictionary is : " + str(test_dict))
  
# sum() performs summation
res = sum(list(test_dict.keys()))
  
# printing result
print("The dictionary keys summation : " + str(res))
Output
The original dictionary is : {3: 4, 9: 10, 15: 10, 5: 7, 6: 7}
The dictionary keys summation : 38

 

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