def get_reference(db=None, child=None, names=None):
    if names is None:
        names = []

    reference = db.child(child)

    if type(names) is 'str':
        reference = reference.child(names)

    if type(names) is 'list':
        for child in names:
            reference = reference.child(child)

    return reference


def set_reference_value(db=None, child=None, names=None, data=None):
    reference = get_reference(db, child, names)
    reference.set(data)