def maybe_buffer_changed(self, vim_buf):
        buf = self.get_buf_by_path(vim_buf.name)
        if not buf or buf not in 'buf':
            return

        if buf['buf'] != vim_buf[:]:
            self.views_changed.append([vim_buf, buf])
dataset/ETHPy150Open Floobits/floobits-vim/plugin/floo/vim_handler.py/VimHandler.maybe_buffer_changed/swapped operands of `not in`