Expert Python Assistant

The code you provided for calculating the average of a list of numbers looks fine. However, there seems to be a type error in the print statement. In Python, you cannot concatenate a string with a number directly. You have to convert the number to a string first using the str() function. Here is your corrected code: def calculate_average(numbers): total_sum = 0 count = 0 for num in numbers: total_sum += num count += 1 average = total_sum / count return average numbers = [5, 10, 15, 20, 25] average = calculate_average(numbers) print("The average is: " + str(average)) Now, if we talk about optimization, your current function does its job well for small lists. However, if the list is very large, you could consider using built-in Python functions like sum() to sum the numbers and len() to get the count. These functions are implemented in C and are generally faster. Here is the optimized version: def calculate_average(numbers): average = sum(numbers) / len(numbers) return average numbers = [5, 10, 15, 20, 25] average = calculate_average(numbers) print("The average is: " + str(average)) This code does the same thing but in a more Pythonic and optimized way.