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

Given a dictionary in Python, write a Python program to find the sum of all items in the dictionary.

Examples:

Input : {‘a’: 100, ‘b’:200, ‘c’:300}
Output : 600

Input : {‘x’: 25, ‘y’:18, ‘z’:45}
Output : 88

Approach #1 : Using Inbuilt sum() Function
Use the sum function to find the sum of dictionary values.

Python3

# Python3 Program to find sum of
# all items in a Dictionary

# Function to print sum


def returnSum(myDict):

    list = []
    for i in myDict:
        list.append(myDict[i])
    final = sum(list)

    return final


# Driver Function
dict = {'a': 100, 'b': 200, 'c': 300}
print("Sum :", returnSum(dict))

Output

Sum : 600

Time Complexity: O(N)

Auxiliary Space: O(N)

Approach #2 : Using For loop to iterate through values using values() function
Iterate through each value of the dictionary using values() function and keep adding it to the sum. 

Python3

# Python3 Program to find sum of
# all items in a Dictionary

# Function to print sum


def returnSum(dict):

    sum = 0
    for i in dict.values():
        sum = sum + i

    return sum


# Driver Function
dict = {'a': 100, 'b': 200, 'c': 300}
print("Sum :", returnSum(dict))

Output

Sum : 600

Time Complexity: O(N)

Auxiliary Space: O(1)

Approach #3: Using For loop to iterate through items of Dictionary
Iterate through each item of the dictionary and simply keep adding the values to the sum variable. 

Python3

# Python3 Program to find sum of
# all items in a Dictionary

# Function to print sum


def returnSum(dict):

    sum = 0
    for i in dict:
        sum = sum + dict[i]

    return sum


# Driver Function
dict = {'a': 100, 'b': 200, 'c': 300}
print("Sum :", returnSum(dict))

Output

Sum : 600

Time Complexity: O(N)

Auxiliary Space: O(1)

Approach #4 : Using dictionary.sum() method to find the sum of values taken out through dictionary.values() function.

Python3

# Python3 Program to find sum of
# all items in a Dictionary

# Function to print sum


def returnSum(dict):
    return sum(dict.values())


# Driver Function
dict = {'a': 100, 'b': 200, 'c': 300}
print("Sum :", returnSum(dict))

Output

Sum : 600

Time Complexity: O(1)

Auxiliary Space: O(1)