""" This is a sample module. """
from typing import List, Union
[docs]def calculate_mean(numbers: List[Union[int, float]]) -> float:
"""
Calculate the mean of a list of numbers.
Parameters
----------
numbers : List[Union[int, float]]
A list of numbers.
Returns
-------
float
The mean of the numbers.
Raises
------
ValueError
If the input is not a list of numbers.
"""
if not isinstance(numbers, list):
raise ValueError("Input must be a list.")
# ensure all elements are numbers
for number in numbers:
if not isinstance(number, (int, float)):
raise ValueError(f"{number} is not a number.")
total = sum(numbers)
average = total / len(numbers)
return average
[docs]def print_mean(numbers: List[Union[int, float]]) -> None:
"""
Print the mean of a list of numbers.
Parameters
----------
numbers : List[Union[int, float]]
A list of numbers.
"""
print("The average is:", calculate_mean(numbers))