def merge2dicts(x, y):
    """Merge two dictionnaries

    Merges two existing dictionnaries, returning a new one.

    Args:
        x (dict): First dictionnary to merge
        y (dict): Second dictionnary to merge

    Returns:
        (dict): Merged dictionnary"""

    z = x.copy()  # start with x's keys and values
    z.update(y)  # modifies z with y's keys and values & returns None

    return z