def process_response(self, value: str) -> PromptType:
        """Process response from user, convert to prompt type.

        Args:
            value (str): String typed by user.

        Raises:
            InvalidResponse: If ``value`` is invalid.

        Returns:
            PromptType: The value to be returned from ask method.
        """
        value = value.strip()
        try:
            return_value: PromptType = self.response_type(value)
        except ValueError:
            raise InvalidResponse(self.validate_error_message)

        if self.choices is not None:
            if not self.check_choice(value):
                raise InvalidResponse(self.illegal_choice_message)

            if not self.case_sensitive:
                # return the original choice, not the lower case version
                return_value = self.response_type(
                    self.choices[
                        [choice.lower() for choice in self.choices].index(value.lower())
                    ]
                )
        return return_value
Process response from user, convert to prompt type.

        Args:
            value (str): String typed by user.

        Raises:
            InvalidResponse: If ``value`` is invalid.

        Returns:
            PromptType: The value to be returned from ask method.
        
rich/prompt.py