<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _convert_to_internal(self, data):
 """From 'Column Title' to 'Column_x0020_Title'"""

        for _dict in data:
            keys = list(_dict.keys())[:]
            for key in keys:
                if key not in self._disp_cols:
                    raise Exception(key + ' not a column in current List.')
                _dict[self._disp_cols[key]['name']] = self._sp_type(key, _dict.pop(key))