Create and set a sensor

[noname9312]

Im trying to create a new sensor and set the data. Unfortunatly I cant figure it out and cant find any examples.

Here is the code of what I want to achieve:
(sensor.mysensor doesnt exists yet)

import requests
import json
import time


def update_sensor():
    # scraping website and filling data
    data = "dummy content"
    state.setattr("sensor.mysensor", data)

while True:
    time.sleep(600)
    update_sensor()

This is only one of many different tries.

Could someone please help me?