How to use the mechanicalsoup.form.Form function in MechanicalSoup

retrieved later with :func:`get_current_form`.
        """
        if isinstance(selector, bs4.element.Tag):
            if selector.name != "form":
                raise LinkNotFoundError
            self.__state.form = Form(selector)
        else:
            # nr is a 0-based index for consistency with mechanize
            found_forms = self.get_current_page().select(selector,
                                                         limit=nr + 1)
            if len(found_forms) != nr + 1:
                if self.__debug:
                    print('select_form failed for', selector)
                    self.launch_browser()
                raise LinkNotFoundError()
            self.__state.form = Form(found_forms[-1])

        return self.get_current_form()

useful if, e.g., there is only one form on the page.
            For ``selector`` syntax, see the `.select() method in BeautifulSoup
            `__.
        :param nr: A zero-based index specifying which form among those that
            match ``selector`` will be selected. Useful when one or more forms
            have the same attributes as the form you want to select, and its
            position on the page is the only way to uniquely identify it.
            Default is the first matching form (``nr=0``).

        :return: The selected form as a soup object. It can also be
            retrieved later with :func:`get_current_form`.
        """
        if isinstance(selector, bs4.element.Tag):
            if selector.name != "form":
                raise LinkNotFoundError
            self.__state.form = Form(selector)
        else:
            # nr is a 0-based index for consistency with mechanize
            found_forms = self.get_current_page().select(selector,
                                                         limit=nr + 1)
            if len(found_forms) != nr + 1:
                if self.__debug:
                    print('select_form failed for', selector)
                    self.launch_browser()
                raise LinkNotFoundError()
            self.__state.form = Form(found_forms[-1])

        return self.get_current_form()

NOTE: To submit a form with a :class:`StatefulBrowser` instance, it is
        recommended to use :func:`StatefulBrowser.submit_selected` instead of
        this method so that the browser state is correctly updated.

        :param form: The filled-out form.
        :param url: URL of the page the form is on. If the form action is a
            relative path, then this must be specified.
        :param \*\*kwargs: Arguments forwarded to `requests.Session.request
            `__.

        :return: `requests.Response
            `__
            object with a *soup*-attribute added by :func:`add_soup`.
        """
        if isinstance(form, Form):
            form = form.form
        response = self._request(form, url, **kwargs)
        self._add_soup(response, self.soup_config)
        return response

NOTE: To submit a form with a :class:`StatefulBrowser` instance, it is
        recommended to use :func:`StatefulBrowser.submit_selected` instead of
        this method so that the browser state is correctly updated.

        :param form: The filled-out form.
        :param url: URL of the page the form is on. If the form action is a
            relative path, then this must be specified.
        :param \\*\\*kwargs: Arguments forwarded to `requests.Session.request
            `__.

        :return: `requests.Response
            `__
            object with a *soup*-attribute added by :func:`add_soup`.
        """
        if isinstance(form, Form):
            form = form.form
        response = self._request(form, url, **kwargs)
        Browser.add_soup(response, self.soup_config)
        return response

retrieved later with the :attr:`form` attribute.
        """
        if isinstance(selector, bs4.element.Tag):
            if selector.name != "form":
                raise LinkNotFoundError
            self.__state.form = Form(selector)
        else:
            # nr is a 0-based index for consistency with mechanize
            found_forms = self.page.select(selector,
                                           limit=nr + 1)
            if len(found_forms) != nr + 1:
                if self.__debug:
                    print('select_form failed for', selector)
                    self.launch_browser()
                raise LinkNotFoundError()
            self.__state.form = Form(found_forms[-1])

        return self.form

useful if, e.g., there is only one form on the page.
            For ``selector`` syntax, see the `.select() method in BeautifulSoup
            `__.
        :param nr: A zero-based index specifying which form among those that
            match ``selector`` will be selected. Useful when one or more forms
            have the same attributes as the form you want to select, and its
            position on the page is the only way to uniquely identify it.
            Default is the first matching form (``nr=0``).

        :return: The selected form as a soup object. It can also be
            retrieved later with the :attr:`form` attribute.
        """
        if isinstance(selector, bs4.element.Tag):
            if selector.name != "form":
                raise LinkNotFoundError
            self.__state.form = Form(selector)
        else:
            # nr is a 0-based index for consistency with mechanize
            found_forms = self.page.select(selector,
                                           limit=nr + 1)
            if len(found_forms) != nr + 1:
                if self.__debug:
                    print('select_form failed for', selector)
                    self.launch_browser()
                raise LinkNotFoundError()
            self.__state.form = Form(found_forms[-1])

        return self.form