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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 atlasdb_get_lastblock( con=None, path=None ):
 """ Get the highest block height in the atlas db """

    row = None
    with AtlasDBOpen(con=con, path=path) as dbcon:

        sql = "SELECT MAX(block_height) FROM zonefiles;"
        args = ()

        cur = dbcon.cursor()
        res = atlasdb_query_execute( cur, sql, args )

        row = {}
        for r in res:
            row.update(r)
            break

    return row['MAX(block_height)']