AttributeError: 'Bot' object has no attribute 'polling'?

Question

Python

I run the script:

import telegram
import config

bot = telegram.Bot(config.token)

chat_id = '@юзернейм чата'
chat_text = 'some text'
bot.send_message(chat_id=chat_id, text=chat_text)

bot.polling(none_stop=True)

A message arrives, but an error still occurs and the script stops working. Mistake:

$ python bot.py
Traceback (most recent call last):
  File "bot.py", line 10, in <module>
    bot.polling(none_stop=True)
AttributeError: 'Bot' object has no attribute 'polling'

I'm not strong in python...