[Python Class Construction] and defining a class function after creation

function_to_class.py

class MathClass:
    """A simple example class"""

    def __init__(self, integer1, integer2):
        self.one = integer1
        self.two = integer2

    def print_nums(self):
        print(f'The numbers are {self.one} and {self.two}')

    def sum_nums(self):
        return self.one + self.two


# %% test class as it stands

nums = MathClass(3, 4)

nums.print_nums()
# 'The numbers are 3 and 4'

nums.sum_nums()
# 7


# %% add a new function to the class


def product(numbers):
    return numbers.one * numbers.two


MathClass.multiply_nums = product

new_nums= MathClass(5, 7)

new_nums.multiply_nums()
# 35