def put_property(elt, key, value, ttl=None, ctx=None):
    """Put properties in elt.

    :param elt: properties elt to put. Not None methods.
    :param number ttl: If not None, property time to leave.
    :param ctx: elt ctx from where put 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.
    :param dict properties: properties to put in elt. elt and ttl are exclude.

    :return: Timer if ttl is not None.
    :rtype: Timer
    """
    return put_properties(elt=elt, properties={key: value}, ttl=ttl, ctx=ctx)
Put properties in elt.

    :param elt: properties elt to put. Not None methods.
    :param number ttl: If not None, property time to leave.
    :param ctx: elt ctx from where put 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.
    :param dict properties: properties to put in elt. elt and ttl are exclude.

    :return: Timer if ttl is not None.
    :rtype: Timer