def __init__(self,<EOL>conn: asynctnt.Connection,<EOL>tube_cls=Tube,<EOL>namespace='<STR_LIT>'):
assert isinstance(conn, asynctnt.Connection),'<STR_LIT>'<EOL>self._conn = conn<EOL>self._tube_cls = tube_cls<EOL>self._tubes = {}<EOL>self._namespace = namespace<EOL>
Queue constructor.

:param conn:
    asynctnt connection (see
    `asynctnt <https://github.com/igorcoding/asynctnt>`__
    documentation)
:param tube_cls:
    Tube class that is used for Tube creation (default is
    :class:`asynctnt_queue.Tube`)
:param namespace:
    Variable which was used for queue module import (
    default is `queue`)