Get elt key property.

    :param elt: property elt. Not None methods.
    :param key: property key to get from elt.
    :param ctx: elt ctx from where get properties. Equals elt if None. It
        allows to get function properties related to a class or instance if
        related function is defined in base class.

    :return: list of property values by elt.
    :rtype: list

def get_property(elt, key, ctx=None):
    """Get elt key property.

    :param elt: property elt. Not None methods.
    :param key: property key to get from elt.
    :param ctx: elt ctx from where get properties. Equals elt if None. It
        allows to get function properties related to a class or instance if
        related function is defined in base class.

    :return: list of property values by elt.
    :rtype: list
    """

    result = []

    properties = get_properties(elt=elt, ctx=ctx, keys=key)

    if key in properties:
        result = properties[key]

    return result