In this article, we are going to see how we can find the sum of elements present in the list. Let's understand the topic with the help of simple examples.
For Examples:
Input: [2,4,6,8]
2+4+6+8 =20
Ouput: 20
​
Input: [9,5,7,8,6]
9+5+7+8+6 =35
Ouput: 35The different ways to calculate the sum of elements present in the list are:
Using for loop
Using sum() function
Using while loop
Sum of the list containing string values
In this method, we will use a loop for accessing each element of the list, and then we will add the elements individually.
Step 1: Declare a variable sum and set its initial value 0
Step 2: Create the list
Step 3: Run a for loop to access each element
Step 4: Add each element of the list to the sum
Step 5: Print the sum
See the below Python code implementation of the above algorithm.
# Python program to find the sum of elements in the list
sum = 0
​
# creating a list
list1 = [10, 5, 20, 15, 30]
​
# Iterate each element in list
# and add them in variable sum
for i in range(0, len(list1)):
  sum = sum + list1[i]
​
# printing the sum
print(f"Sum of the elements in the given list: {sum}")​Output:
Sum of the elements in the given list: 80
In this method, we will use the built-in function sum() which will calculate the sum of all the elements present in the array and return sum.
Step 1 : Initialize the list
Step 2 : Use the sum() function
Step 3 : Print the sum
See the below Python code implementation of the above algorithm.
# Python program to find the sum of elements in the list
​
# creating a list
list1 = [10, 5, 20, 15, 30]
​
# using sum() function
total = sum(list1)
​
# printing total value
print("Sum of all elements in given list: ", total)​Output:
Sum of all elements in given list: 80
Step 1: Declare a variable for storing the sum
Step 2: Declare another variable and set it to 0.
Step 3: Create the list
Step 4: Run while loop to access each element
Step 5: Add each element of list to the sum
Step 6: Add 1 to that variable each time when the loop runs
Step 7: Print the sum
See the below Python code implementation of the above algorithm.
# Python program to find the sum of elements in the list
sum = 0
ele = 0
​
# creating a list
list1 = [10, 5, 20, 15, 30]
​
# Iterate each element in list
# and add them in variable sum
while(ele < len(list1)):
  sum = sum + list1[ele]
  ele += 1
​
# printing total value
print("Sum of all elements in given list: ", sum)​Output:
Sum of all elements in given list: 80
Step 1: Declare a variable for storing the sum
Step 2: Create the list
Step 3: Run a for loop to access each element
Step 4: Use int() method to convert the string into integers and add them in the sum
Step 5 : Print the sum
See the below Python code implementation of the above algorithm.
# Python code to calculate sum of list containing integer as a string
# Using for loop
​
# Declare a variable and set it to 0
numsum = 0
​
# Create a list of numbers as string
numlist = ['10', '5', '20', '15', '30']
​
​
# Iterate each element in list
# and add them in variable sum
for i in numlist:
  numsum += int(i)
​
# print the sum
print('Sum of all the element in given list: ', numsum)​Output:
Sum of all the element in given list: 80
In this tutorial, we have learned different methods for calculating the sum of elements present in the list. We can use for loop, while loop, and sum() method to achieve it. But the sum() method is faster when we have to handle the huge lists of elements.