"""This file show some basic styles on how to write code and docstrings.
It also serves as an example for tests
"""


def hello_world():
    """Prints Hello World!"""
    print("Hello World!")


def return_input(input=None):
    """Returns the input parameter as is

    Parameters
    ----------
    input: Any
        any input which should be returned
        defaults to None
    """
    return input
