> ## Documentation Index
> Fetch the complete documentation index at: https://notes.kodekloud.com/llms.txt
> Use this file to discover all available pages before exploring further.
# Iterating Lists
> This lesson explores using a for loop in Python to iterate through a list and calculate the average age from a dataset.
In this lesson, we will explore how to use a for loop to iterate through a list in Python to calculate the average age from a dataset. The process involves summing all the ages and then dividing that total by the number of ages using the built-in len() function.
## Step 1: Calculate the Total Sum of Ages
Start by initializing a variable called total to zero. Then, iterate over each element in the list to accumulate the sum of the ages:
```python theme={null}
ages = [56, 72, 24, 46]
total = 0
for age in ages:
total += age
```
During each iteration, the value of the current age is added to the total. After the loop completes, the total sum of the ages becomes 198.
## Step 2: Compute the Average Age
After obtaining the total sum, calculate the average by dividing the total by the number of items in the list:
```python theme={null}
average = total / len(ages)
print(average)
# Output:
# 49.5
```
In this example, the average age is computed by dividing the sum of ages (198) by the length of the list (4), which results in an average age of 49.5.
That’s all for this lesson. More exciting topics and tutorials will be covered soon—stay tuned for further updates on Python programming techniques!