def change_container_lease(<EOL>self, container_name, lease_id, proposed_lease_id,<EOL>if_modified_since=None, if_unmodified_since=None, timeout=None):
_validate_not_none('<STR_LIT>', lease_id)<EOL>self._lease_container_impl(container_name, <EOL>_LeaseActions.Change,<EOL>lease_id,<EOL>None, <EOL>None, <EOL>proposed_lease_id,<EOL>if_modified_since,<EOL>if_unmodified_since,<EOL>timeout)<EOL>
Changes the lease ID for a lock on a container for delete operations.
The lock duration can be 15 to 60 seconds, or can be infinite.

:param str container_name:
    Name of existing container.
:param str lease_id:
    Lease ID for active lease.
:param str proposed_lease_id:
    Proposed lease ID, in a GUID string format. The Blob service returns 400
    (Invalid request) if the proposed lease ID is not in the correct format.
: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.