def _update_section_contents(self, contents, section_name, new_values):
        # First, find the line where the section_name is defined.
        # This will be the value of i.
        new_values = new_values.copy()
        # ``contents`` is a list of file line contents.
        section_start_line_num = self._find_section_start(contents,
                                                          section_name)
        # If we get here, then we've found the section.  We now need
        # to figure out if we're updating a value or adding a new value.
        # There's 2 cases.  Either we're setting a normal scalar value
        # of, we're setting a nested value.
        last_matching_line = section_start_line_num
        j = last_matching_line + 1
        while j < len(contents):
            line = contents[j]
            if self.SECTION_REGEX.search(line) is not None:
                # We've hit a new section which means the config key is
                # not in the section.  We need to add it here.
                self._insert_new_values(line_number=last_matching_line,
                                        contents=contents,
                                        new_values=new_values)
                return
            match = self.OPTION_REGEX.search(line)
            if match is not None:
                last_matching_line = j
                key_name = match.group(1).strip()
                if key_name in new_values:
                    # We've found the line that defines the option name.
                    # if the value is not a dict, then we can write the line
                    # out now.
                    if not isinstance(new_values[key_name], dict):
                        option_value = new_values[key_name]
                        new_line = '%s = %s\n' % (key_name, option_value)
                        contents[j] = new_line
                        del new_values[key_name]
                    else:
                        j = self._update_subattributes(
                            j, contents, new_values[key_name],
                            len(match.group(1)) - len(match.group(1).lstrip()))
                        return
            j += 1

        if new_values:
            if not contents[-1].endswith('\n'):
                contents.append('\n')
            self._insert_new_values(line_number=last_matching_line + 1,
                                    contents=contents,
                                    new_values=new_values)
dataset/ETHPy150Open aws/aws-cli/awscli/customizations/configure/writer.py/ConfigFileWriter._update_section_contents/original