def fix_e231(self, result):
        """Add missing whitespace."""
        # Optimize for comma case. This will fix all commas in the full source
        # code in one pass. Don't do this more than once. If it fails the first
        # time, there is no point in trying again.
        if ',' in result['info'] and not self._ws_comma_done:
            self._ws_comma_done = True
            original = ''.join(self.source)
            new = refactor(original, ['ws_comma'])
            if original.strip() != new.strip():
                self.source = [new]
                return range(1, 1 + len(original))

        line_index = result['line'] - 1
        target = self.source[line_index]
        offset = result['column']
        fixed = target[:offset] + ' ' + target[offset:]
        self.source[line_index] = fixed
dataset/ETHPy150Open jdf/processing.py/mode/formatter/autopep8.py/FixPEP8.fix_e231/original