Python program to find the sum of all items in a dictionary

In this article, we will learn different approaches to calculate the sum of all values in a dictionary. Python provides several methods to iterate through dictionary values and compute their total.

Problem statement ? We are given a dictionary, and we need to calculate the sum of all its values.

Here are four effective approaches to solve this problem ?

Method 1: Using Dictionary Items Iteration

This approach iterates through dictionary items and accesses values using keys ?

# sum function
def calculate_sum(my_dict):
    total = 0
    for key in my_dict:
        total = total + my_dict[key]
    return total

# Driver Function
data = {'A': 10, 'B': 20, 'C': 30, 'D': 40}
print("Sum of dictionary values:", calculate_sum(data))

Sum of dictionary values: 100

Method 2: Using Dictionary Values() Method

This approach directly iterates through dictionary values using the values() method ?

# sum function
def calculate_sum(my_dict):
    total = 0
    for value in my_dict.values():
        total = total + value
    return total

# Driver Function
data = {'A': 10, 'B': 20, 'C': 30, 'D': 40}
print("Sum of dictionary values:", calculate_sum(data))

Sum of dictionary values: 100

Method 3: Using Dictionary Keys() Method

This approach iterates through dictionary keys and accesses values using key indexing ?

# sum function
def calculate_sum(my_dict):
    total = 0
    for key in my_dict.keys():
        total = total + my_dict[key]
    return total

# Driver Function
data = {'A': 10, 'B': 20, 'C': 30, 'D': 40}
print("Sum of dictionary values:", calculate_sum(data))

Sum of dictionary values: 100

Method 4: Using Built-in sum() Function

The most Pythonic approach uses the built-in sum() function with values() ?

# Using built-in sum function
data = {'A': 10, 'B': 20, 'C': 30, 'D': 40}
total = sum(data.values())
print("Sum of dictionary values:", total)

Sum of dictionary values: 100

Comparison

Conclusion

The built-in sum() function with values() is the most efficient and readable approach. Use manual iteration methods when you need additional processing logic during summation.