    def enable(self, columns=None):
        """
        Enable all widgets in the specified columns of  this Layout.

        :param columns: The list of columns to enable.  Defaults to all columns.
        """
        # Enable all widgets in required columns.
        for column in columns if columns else range(len(self._columns)):
            for widget in self._columns[column]:
                widget.disabled = False
Enable all widgets in the specified columns of  this Layout.

:param columns: The list of columns to enable.  Defaults to all columns.
asciimatics/widgets/layout.py