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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def atlas_peer_refresh_zonefile_inventory( my_hostport, peer_hostport, byte_offset, timeout=None, peer_table=None, con=None, path=None, local_inv=None ):
 """ Refresh a peer's zonefile recent inventory vector entries, by removing every bit after byte_offset and re-synchronizing them. The intuition here is that recent zonefiles are much rarer than older zonefiles (which will have been near-100% replicated), meaning the tail of the peer's zonefile inventory is a lot less stable than the head (since peers will be actively distributing recent zonefiles). NOT THREAD SAFE; CALL FROM ONLY ONE THREAD. Return True if we synced all the way up to the expected inventory length, and update the refresh time in the peer table. Return False if not. """


    if timeout is None:
        timeout = atlas_inv_timeout()

    if local_inv is None:
        # get local zonefile inv 
        inv_len = atlasdb_zonefile_inv_length( con=con, path=path )
        local_inv = atlas_make_zonefile_inventory( 0, inv_len, con=con, path=path )

    maxlen = len(local_inv)

    with AtlasPeerTableLocked(peer_table) as ptbl:
        if peer_hostport not in ptbl.keys():
            return False

        # reset the peer's zonefile inventory, back to offset
        cur_inv = atlas_peer_get_zonefile_inventory( peer_hostport, peer_table=ptbl )
        atlas_peer_set_zonefile_inventory( peer_hostport, cur_inv[:byte_offset], peer_table=ptbl )

    inv = atlas_peer_sync_zonefile_inventory( my_hostport, peer_hostport, maxlen, timeout=timeout, peer_table=peer_table )

    with AtlasPeerTableLocked(peer_table) as ptbl:
        if peer_hostport not in ptbl.keys():
            return False

        # Update refresh time (even if we fail)
        ptbl[peer_hostport]['zonefile_inventory_last_refresh'] = time_now()

    if inv is not None:
        inv_str = atlas_inventory_to_string(inv)
        if len(inv_str) > 40:
            inv_str = inv_str[:40] + "..."

        log.debug("%s: inventory of %s is now '%s'" % (my_hostport, peer_hostport, inv_str))

    if inv is None:
        return False

    else:
        return True