def _check_tbit(self, **keys):
colnums = keys.get('<STR_LIT>', None)<EOL>if colnums is None:<EOL><INDENT>colnums = self._extract_colnums()<EOL><DEDENT>has_tbit = False<EOL>for i, colnum in enumerate(colnums):<EOL><INDENT>npy_type, isvar, istbit = self._get_tbl_numpy_dtype(colnum)<EOL>if (istbit):<EOL><INDENT>has_tbit = True<EOL>break<EOL><DEDENT><DEDENT>return has_tbit<EOL>
Check if one of the columns is a TBIT column

parameters
----------
colnums: integer array, optional