code: def namedb_get_names_by_sender( cur, sender, current_block ):
      
  
      unexpired_query, unexpired_args = namedb_select_where_unexpired_names( current_block )
  
      query = "SELECT name_records.name FROM name_records JOIN namespaces ON name_records.namespace_id = namespaces.namespace_id " + \
              "WHERE name_records.sender = ? AND name_records.revoked = 0 AND " + unexpired_query + ";"
  
      args = (sender,) + unexpired_args
  
      name_rows = namedb_query_execute( cur, query, args )
      names = []
  
      for name_row in name_rows:
          names.append( name_row['name'] )
  
      return names
docs: Given a sender pubkey script, find all the non-expired non-revoked names owned by it.
      Return None if the sender owns no names.