added a demo class

    >>> a_demo_function(None)

    """

    return None

class ADemoClass:

    """

    A demo class.

    This class is a demo.

    This is a second-line comment for extended summary.

    Parameters

    ----------

    first_name : str

        The first name.

    last_name : str

        The last name.

    Attributes

    ----------

    first_name : str

        The first name.

    last_name : str

        The last name.

    Methods

    -------

    say_hello()

        Print hello message.

    Examples

    --------

    >>> a = ADemoClass("Jane", "Doe")

    >>> a.say_hello()

    """

    def __init__(self, first_name, last_name):

        self.first_name = first_name

        self.last_name = last_name

    def say_hello(self):

        print("Hello, {} {}!".format(self.first_name, self.last_name))

from .flip_image import flip_image, read_test_image

from .some_other_modules import a_demo_function

from .some_other_modules import a_demo_function, ADemoClass

__all__ = ["flip_image", "read_test_image", "a_demo_function"]

__all__ = ["flip_image", "read_test_image", "a_demo_function", "ADemoClass"]