How to use the sendgrid.helpers.mail.Category function in sendgrid

message.section = Section(
            '%section1%', 'Substitution for Section 1 Tag')
        message.section = [
            Section('%section2%', 'Substitution for Section 2 Tag'),
            Section('%section3%', 'Substitution for Section 3 Tag')
        ]

        message.header = Header('X-Test9', 'Test9')
        message.header = Header('X-Test10', 'Test10')
        message.header = [
            Header('X-Test11', 'Test11'),
            Header('X-Test12', 'Test12')
        ]

        message.category = Category('Category 1')
        message.category = Category('Category 2')
        message.category = [
            Category('Category 1'),
            Category('Category 2')
        ]

        message.custom_arg = CustomArg('marketing5', 'false')
        message.custom_arg = CustomArg('transactional5', 'true')
        message.custom_arg = [
            CustomArg('marketing6', 'true'),
            CustomArg('transactional6', 'false')
        ]

        message.send_at = SendAt(1461775053)

        message.batch_id = BatchId("HkJ5yLYULb7Rj8GKSx7u025ouWVlMgAi")

for e in email.bcc:
            personalization.add_bcc(Email(e))
        personalization.set_subject(email.subject)
        mail.add_content(Content("text/plain", email.body))
        if isinstance(email, EmailMultiAlternatives):
            for alt in email.alternatives:
                if alt[1] == "text/html":
                    mail.add_content(Content(alt[1], alt[0]))
        elif email.content_subtype == "html":
            mail.contents = []
            mail.add_content(Content("text/plain", ' '))
            mail.add_content(Content("text/html", email.body))

        if hasattr(email, 'categories'):
            for c in email.categories:
                mail.add_category(Category(c))

        if hasattr(email, 'custom_args'):
            for k, v in email.custom_args.items():
                mail.add_custom_arg(CustomArg(k, v))

        if hasattr(email, 'template_id'):
            mail.set_template_id(email.template_id)
            if hasattr(email, 'substitutions'):
                for key, value in email.substitutions.items():
                    personalization.add_substitution(Substitution(key, value))

        # SendGrid does not support adding Reply-To as an extra
        # header, so it needs to be manually removed if it exists.
        reply_to_string = ""
        for key, value in email.extra_headers.items():
            if key.lower() == "reply-to":

Section('%section2%', 'Substitution for Section 2 Tag'),
        Section('%section3%', 'Substitution for Section 3 Tag')    
    ]

    message.header = Header('X-Test9', 'Test9')
    message.header = Header('X-Test10', 'Test10')
    message.header = [
        Header('X-Test11', 'Test11'),
        Header('X-Test12', 'Test12')
    ]

    message.category = Category('Category 1')
    message.category = Category('Category 2')
    message.category = [
        Category('Category 1'),
        Category('Category 2')
    ]

    message.custom_arg = CustomArg('marketing5', 'false')
    message.custom_arg = CustomArg('transactional5', 'true')
    message.custom_arg = [
        CustomArg('marketing6', 'true'),
        CustomArg('transactional6', 'false')
    ]

    message.send_at = SendAt(1461775053)

    message.batch_id = BatchId("HkJ5yLYULb7Rj8GKSx7u025ouWVlMgAi")

    message.asm = Asm(GroupId(1), GroupsToDisplay([1,2,3,4]))

    message.ip_pool_name = IpPoolName("IP Pool Name")

message.template_id = TemplateId('13b8f94f-bcae-4ec6-b752-70d6cb59f932')

    message.section = Section('%section1%', 'Substitution for Section 1 Tag')
    message.section = [
        Section('%section2%', 'Substitution for Section 2 Tag'),
        Section('%section3%', 'Substitution for Section 3 Tag')    
    ]

    message.header = Header('X-Test9', 'Test9')
    message.header = Header('X-Test10', 'Test10')
    message.header = [
        Header('X-Test11', 'Test11'),
        Header('X-Test12', 'Test12')
    ]

    message.category = Category('Category 1')
    message.category = Category('Category 2')
    message.category = [
        Category('Category 1'),
        Category('Category 2')
    ]

    message.custom_arg = CustomArg('marketing5', 'false')
    message.custom_arg = CustomArg('transactional5', 'true')
    message.custom_arg = [
        CustomArg('marketing6', 'true'),
        CustomArg('transactional6', 'false')
    ]

    message.send_at = SendAt(1461775053)

    message.batch_id = BatchId("HkJ5yLYULb7Rj8GKSx7u025ouWVlMgAi")

msg.body = ' ' if msg.body == '' else msg.body

        if isinstance(msg, EmailMultiAlternatives):
            mail.add_content(Content("text/plain", msg.body))
            for alt in msg.alternatives:
                if alt[1] == "text/html":
                    mail.add_content(Content(alt[1], alt[0]))
        elif msg.content_subtype == "html":
            mail.add_content(Content("text/plain", " "))
            mail.add_content(Content("text/html", msg.body))
        else:
            mail.add_content(Content("text/plain", msg.body))

        if hasattr(msg, "categories"):
            for cat in msg.categories:
                mail.add_category(Category(cat))

        if hasattr(msg, "asm"):
            if "group_id" not in msg.asm:
                raise KeyError("group_id not found in asm")

            if "groups_to_display" in msg.asm:
                mail.asm = ASM(msg.asm["group_id"], msg.asm["groups_to_display"])
            else:
                mail.asm = ASM(msg.asm["group_id"])

        mail_settings = MailSettings()
        mail_settings.sandbox_mode = SandBoxMode(self.sandbox_mode)
        mail.mail_settings = mail_settings

        tracking_settings = TrackingSettings()
        tracking_settings.open_tracking = OpenTracking(self.track_email)

message.section = [
        Section('%section2%', 'Substitution for Section 2 Tag'),
        Section('%section3%', 'Substitution for Section 3 Tag')    
    ]

    message.header = Header('X-Test9', 'Test9')
    message.header = Header('X-Test10', 'Test10')
    message.header = [
        Header('X-Test11', 'Test11'),
        Header('X-Test12', 'Test12')
    ]

    message.category = Category('Category 1')
    message.category = Category('Category 2')
    message.category = [
        Category('Category 1'),
        Category('Category 2')
    ]

    message.custom_arg = CustomArg('marketing5', 'false')
    message.custom_arg = CustomArg('transactional5', 'true')
    message.custom_arg = [
        CustomArg('marketing6', 'true'),
        CustomArg('transactional6', 'false')
    ]

    message.send_at = SendAt(1461775053)

    message.batch_id = BatchId("HkJ5yLYULb7Rj8GKSx7u025ouWVlMgAi")

    message.asm = Asm(GroupId(1), GroupsToDisplay([1,2,3,4]))

Send an email based on a template.
    :param str email: The email recipient
    :param str template_id: The template ID of the email.
    :param str template_id: The group ID of the email.
    pass to the email template.
    """
    mail = sendgrid.helpers.mail.Mail()

    mail.from_email = sendgrid.Email("halite@halite.io", "Halite Challenge")
    personalization = sendgrid.helpers.mail.Personalization()
    personalization.add_to(sendgrid.helpers.mail.Email(email, email))

    mail.add_personalization(personalization)
    mail.template_id = template_id
    mail.asm = sendgrid.helpers.mail.ASM(group_id, [config.GOODNEWS_ACCOMPLISHMENTS, config.GAME_ERROR_MESSAGES, config.RESEARCH_EMAILS, config.NEWSLETTERS_ARTICLES])
    mail.add_category(sendgrid.helpers.mail.Category(category))
    settings = sendgrid.helpers.mail.MailSettings()
    settings.sandbox_mode = sendgrid.helpers.mail.SandBoxMode(config.SENDGRID_SANDBOX_MODE)
    mail.mail_settings = settings

    try:
        response = sg.client.mail.send.post(request_body=mail.get())
        print(response.status_code)
    except UnauthorizedError as e:
        app.logger.error("Could not send email", exc_info=e)

message.section = Section('%section1%', 'Substitution for Section 1 Tag')
    message.section = [
        Section('%section2%', 'Substitution for Section 2 Tag'),
        Section('%section3%', 'Substitution for Section 3 Tag')    
    ]

    message.header = Header('X-Test9', 'Test9')
    message.header = Header('X-Test10', 'Test10')
    message.header = [
        Header('X-Test11', 'Test11'),
        Header('X-Test12', 'Test12')
    ]

    message.category = Category('Category 1')
    message.category = Category('Category 2')
    message.category = [
        Category('Category 1'),
        Category('Category 2')
    ]

    message.custom_arg = CustomArg('marketing5', 'false')
    message.custom_arg = CustomArg('transactional5', 'true')
    message.custom_arg = [
        CustomArg('marketing6', 'true'),
        CustomArg('transactional6', 'false')
    ]

    message.send_at = SendAt(1461775053)

    message.batch_id = BatchId("HkJ5yLYULb7Rj8GKSx7u025ouWVlMgAi")