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To find the sum of all the elements in a list.

1. Read input number asking for length of the list using input()
2. Initialise an empty list lst = [].
3. Read each number using a for loop.
4. In the for loop append each number to the list.
5. Now we use predefined function sum() to find the sum of all the elements in a list.
6. Print the result.

By Using Buil-in Function sum()

li = [] 
n = int(input("Enter the number of elements: ")) 
for i in range(n): 
    elem = int(input("Enter the elements: ")) 
    li.append(elem) 
print("The list:",li) 
print("The sum of the list = {}".format(sum(li)))

Test Case-1

li = [] 
n = int(input("Enter the number of elements: ")) 
for i in range(n): 
    elem = int(input("Enter the elements: ")) 
    li.append(elem) 
print("The list:",li) 
print("The sum of the list = {}".format(sum(li)))

Enter the number of elements: 4
Enter the elements: 30
Enter the elements: 30
Enter the elements: 30
Enter the elements: 30
The list: [30, 30, 30, 30]
The sum of the list = 120

Test Case-2

li = [] 
n = int(input("Enter the number of elements: ")) 
for i in range(n): 
    elem = int(input("Enter the elements: ")) 
    li.append(elem) 
print("The list:",li) 
print("The sum of the list = {}".format(sum(li)))

Enter the number of elements: 10
Enter the elements: 4
Enter the elements: 5
Enter the elements: -10
Enter the elements: 20
Enter the elements: -50
Enter the elements: 30
Enter the elements: -9
Enter the elements: -2
Enter the elements: 0
Enter the elements: 7
The list: [4, 5, -10, 20, -50, 30, -9, -2, 0, 7]
The sum of the list = -5

Without Built-in Function Finding Sum

Source Code

numbers = [] 
n = int(input("Enter the elements: ")) 
for i in range(0, n): 
    elem = int(input("Enter the elements: ")) 
    numbers.append(elem) 

def findSum(numbers): 
    total = 0 
    for j in numbers: 
        total += j 
    return total 


if __name__ == '__main__': 
    temp = findSum(numbers)
    print("The created list: ",numbers)
    print("The Sum = ",temp)

Test Case-1

numbers = [] 
n = int(input("Enter the elements: ")) 
for i in range(0, n): 
    elem = int(input("Enter the elements: ")) 
    numbers.append(elem) 

def findSum(numbers): 
    total = 0 
    for j in numbers: 
        total += j 
    return total 


if __name__ == '__main__': 
    temp = findSum(numbers)
    print("The created list: ",numbers)
    print("The Sum = ",temp)
    

Enter the elements: 4
Enter the elements: 30
Enter the elements: 40
Enter the elements: 10
Enter the elements: 20
The created list:  [30, 40, 10, 20]
The Sum =  100

numbers = [] 
n = int(input("Enter the elements: ")) 
for i in range(0, n): 
    elem = int(input("Enter the elements: ")) 
    numbers.append(elem) 

def findSum(numbers): 
    total = 0 
    for j in numbers: 
        total += j 
    return total 


if __name__ == '__main__': 
    temp = findSum(numbers)
    print("The created list: ",numbers)
    print("The Sum = ",temp)

Jubayer Hossain

Please share your tips or tricks for solving this problem in a better way! Happy Coding!