Python Function to Calculate Average of List Using For Loop

Here's a Python function that computes and prints the average value of a list of numbers using a for loop:

def compute_average(numbers):
    total = 0
    for num in numbers:
        total += num
    average = total / len(numbers)
    print('The average is:', average)
    return average

You can call this function by passing a list of numbers as the argument, like this:

numbers_list = [1, 2, 3, 4, 5]
average = compute_average(numbers_list)

This will compute the average of the numbers in the list and print 'The average is: 3.0' to the console. The average value will also be returned by the function and stored in the average variable.