custom_states.py

import telebot # telebot

from telebot import custom_filters
from telebot.handler_backends import State, StatesGroup #States

# States storage
from telebot.storage import StateMemoryStorage


# Beginning from version 4.4.0+, we support storages.
# StateRedisStorage -> Redis-based storage.
# StatePickleStorage -> Pickle-based storage.
# For redis, you will need to install redis.
# Pass host, db, password, or anything else,
# if you need to change config for redis.
# Pickle requires path. Default path is in folder .state-saves.
# If you were using older version of pytba for pickle, 
# you need to migrate from old pickle to new by using
# StatePickleStorage().convert_old_to_new()



# Now, you can pass storage to bot.
state_storage = StateMemoryStorage() # you can init here another storage

bot = telebot.TeleBot("TOKEN",
state_storage=state_storage)


# States group.
class MyStates(StatesGroup):
    # Just name variables differently
    name = State() # creating instances of State class is enough from now
    surname = State()
    age = State()




@bot.message_handler(commands=['start'])
def start_ex(message):
    """
    Start command. Here we are starting state
    """
    bot.set_state(message.from_user.id, MyStates.name, message.chat.id)
    bot.send_message(message.chat.id, 'Hi, write me a name')
 

# Any state
@bot.message_handler(state="*", commands='cancel')
def any_state(message):
    """
    Cancel state
    """
    bot.send_message(message.chat.id, "Your state was cancelled.")
    bot.delete_state(message.from_user.id, message.chat.id)

@bot.message_handler(state=MyStates.name)
def name_get(message):
    """
    State 1. Will process when user's state is MyStates.name.
    """
    bot.send_message(message.chat.id, f'Now write me a surname')
    bot.set_state(message.from_user.id, MyStates.surname, message.chat.id)
    with bot.retrieve_data(message.from_user.id, message.chat.id) as data:
        data['name'] = message.text
 
 
@bot.message_handler(state=MyStates.surname)
def ask_age(message):
    """
    State 2. Will process when user's state is MyStates.surname.
    """
    bot.send_message(message.chat.id, "What is your age?")
    bot.set_state(message.from_user.id, MyStates.age, message.chat.id)
    with bot.retrieve_data(message.from_user.id, message.chat.id) as data:
        data['surname'] = message.text
 
# result
@bot.message_handler(state=MyStates.age, is_digit=True)
def ready_for_answer(message):
    """
    State 3. Will process when user's state is MyStates.age.
    """
    with bot.retrieve_data(message.from_user.id, message.chat.id) as data:
        bot.send_message(message.chat.id, "Ready, take a look:\n<b>Name: {name}\nSurname: {surname}\nAge: {age}</b>".format(name=data['name'], surname=data['surname'], age=message.text), parse_mode="html")
    bot.delete_state(message.from_user.id, message.chat.id)

#incorrect number
@bot.message_handler(state=MyStates.age, is_digit=False)
def age_incorrect(message):
    """
    Wrong response for MyStates.age
    """
    bot.send_message(message.chat.id, 'Looks like you are submitting a string in the field age. Please enter a number')

# register filters

bot.add_custom_filter(custom_filters.StateFilter(bot))
bot.add_custom_filter(custom_filters.IsDigitFilter())

bot.infinity_polling(skip_pending=True)