# How to sum a List in Python using For loop : Steps

There are many ways to sum a list in python. But in this tutorial, you will learn how to sum a list in Python using a for loop.

## Steps to sum a list in Python using a for loop

Lets know all the steps to sum a list in python using for loop.

### Step 1: Create a list of numbers

First, let’s create a list of numbers we will be using the for loop on them to add together. We can use a for loop to iterate over each element in the list and calculate the sum in a variable.

``sample_list = [10, 20, 30]``

### Step 2: Create a temp variable  to store the sum

In this step, you will create a temporary variable that will store the sum of all the elements of the list.

``total_sum = 0``

### Step 3: Use the for loop

Now the next step is to iterate each element of the loop and with each iteration add the element with the total_sum variable.

``````for element in sample_list:
total_sum += element
``````

### Step 4: Print the sum

The last step is to print the sum of the elements. For this, I will use the print() function.

``print("The sum of the list is:", total_sum)``

Run the below lines of code.

``````sample_list = [10, 20, 30]
total_sum = 0
for element in sample_list:
total_sum += element
print("The sum of the list is:", total_sum)
``````

Output

Explanation of the code

In this code, you have a list of numbers called sample_list. Then you will initialize a variable called total_sum to zero. After that, you will use a for loop to iterate over each element in the list. For each element, you will add it to the total_sum variable using the += operator, which is a shorthand for total_sum = total_sum + element.

After the loop completes, total_sum will contain the sum of all elements in the list. Finally, you will print the result using the print() function.

Let’s try all the steps of the second list.

``````sample_list = [100, 200, 300,400]
total_sum = 0
for element in sample_list:
total_sum += element
print("The sum of the list is:", total_sum)
``````

Output