def release_container_lease(<EOL>self, container_name, lease_id, if_modified_since=None,<EOL>if_unmodified_since=None, timeout=None):
_validate_not_none('<STR_LIT>', lease_id)<EOL>self._lease_container_impl(container_name, <EOL>_LeaseActions.Release,<EOL>lease_id,<EOL>None, <EOL>None, <EOL>None, <EOL>if_modified_since,<EOL>if_unmodified_since,<EOL>timeout)<EOL>
Release the lease. The lease may be released if the lease_id specified matches
that associated with the container. Releasing the lease allows another client
to immediately acquire the lease for the container as soon as the release is complete. 

:param str container_name:
    Name of existing container.
:param str lease_id:
    Lease ID for active lease.
:param datetime if_modified_since:
    A DateTime value. Azure expects the date value passed in to be UTC.
    If timezone is included, any non-UTC datetimes will be converted to UTC.
    If a date is passed in without timezone info, it is assumed to be UTC. 
    Specify this header to perform the operation only
    if the resource has been modified since the specified time.
:param datetime if_unmodified_since:
    A DateTime value. Azure expects the date value passed in to be UTC.
    If timezone is included, any non-UTC datetimes will be converted to UTC.
    If a date is passed in without timezone info, it is assumed to be UTC.
    Specify this header to perform the operation only if
    the resource has not been modified since the specified date/time.
:param int timeout:
    The timeout parameter is expressed in seconds.