Python Programs | IT Developer
IT Developer

Python Programs

Share with a Friend
Previous
HOME
Next

Python Programs - Operators and Expressions

Calculate the average of a list of numbers - Python Program

Example 1:

Python 

numbers = [10, 20, 30, 40, 50]
average = sum(numbers) / len(numbers)
print("Average:", average)

Output

 
OUTPUT  :
Average: 30.0

Example 2:

Python 

def calculate_average(numbers):
  """
  Calculates the average of a list of numbers.

  Args:
    numbers: A list of numeric values (integers or floats).

  Returns:
    The average of the numbers in the list. Returns 0 if the list is empty
    to prevent division by zero errors.
  """
  if not numbers:  # Check if the list is empty
    return 0
  
  total_sum = sum(numbers)
  count = len(numbers)
  average = total_sum / count
  return average

# Example usage:
my_list = [10, 20, 30, 40, 50]
avg = calculate_average(my_list)
print(f"The list of numbers: {my_list}")
print(f"The average of the numbers is: {avg}")

empty_list = []
avg_empty = calculate_average(empty_list)
print(f"\nThe list of numbers: {empty_list}")
print(f"The average of the numbers is: {avg_empty}")

Output

 
OUTPUT  :
The list of numbers: [10, 20, 30, 40, 50]
The average of the numbers is: 30.0

The list of numbers: []
The average of the numbers is: 0

Explanation

  • calculate_average(numbers)function:
    • This function takes one argument, numbers, which is expected to be a list containing numeric values.
    • Empty list handling:It first checks if the input numbers list is empty using if not numbers:. If it's empty, it returns 0 to avoid a ZeroDivisionError when attempting to divide by the length of an empty list.
    • Summation:total_sum = sum(numbers) calculates the sum of all elements in the numbers
    • Counting elements:count = len(numbers) determines the number of elements (the length) in the numbers
    • Average calculation:average = total_sum / count performs the division to compute the average.
    • Return value:The calculated average is returned.
  • Example Usage:
    • A sample list my_listis created with integer values.
    • The calculate_averagefunction is called with my_list, and the result is stored in the avg
    • The original list and its calculated average are printed using an f-string for clear output.
    • An empty_listis also tested to demonstrate the handling of empty input.

 

Previous
Next