def _debugcharsFn(self, x, y):
        if self._screenchar[x][y] not in (None, '\n', '\t'):
            return '.'
        else:
            return self._screenchar[x][y]
dataset/ETHPy150Open asweigart/pygcurse/pygcurse/__init__.py/PygcurseSurface._debugcharsFn/operator `in` -> `not in`