How to handle several user requests in pytelegrambotapi[Telegram] - bots

Question

I am new to telegram bot development. I use python 3.9
My bot works fine when 1 person uses but 2 or more it gives me Error code: 400. Description: Bad Request: message to edit not found
I use pytelegrambotapi and imported telebot
Here is my code:
import telebot
#bot.message_handler(commands = ["start"])
def start_bot(message):
global user
#--------creating new user or load old user data--------
user = USER(message.chat.id)
#-----------asking-----------
if user.isFull():
user.last_message = bot.send_message(message.chat.id,
f"Hello {user.fish}",
reply_markup=MAIN_MENU)
else:
bot.delete_message(message.chat.id, message.message_id)
bot.send_message(message.chat.id, "*Some post", reply_markup=None)
user.info_post_id = bot.send_message(message.chat.id, user.user_info_checking()).message_id
user.last_message = bot.send_message(message.chat.id, 'Name:')
#bot.message_handler(content_types=['text'])
def get_name_and_age(message):
global user
chat_id = message.chat.id
if user.last_message.text=='Name:':
user.fish = message.text
bot.delete_message(chat_id, message.message_id)
bot.edit_message_text(chat_id=chat_id,
message_id=user.info_post_id,
text=user.user_info_checking(),
reply_markup=None)
user.last_message = bot.edit_message_text(chat_id=chat_id,
message_id=user.last_message.message_id,
text="Age:",
reply_markup=None)
got this error
I need to keep my bot chat clean so I need to delete or edit messages but I got the error.
I used user class to save induvidual message and its id to track but still failed:
def __init__(self, id):
self.id = id
self.motion = None
self.info_post_id = None
self.last_message = None
self.last_error = None
self.post_counter = None
self.current_post = None
self.current_post_id = 0
self.current_post_link = None
self.current_catalog = None
self.current_channel_id = None
self.current_category = None
self.current_sub_category = None

Answer 1

The issue is likely the use of your global variable user. When two different users are using your bot at the same time, you write data from both of them into this object. Instead you do something like
user_info = defaultdict(USER)
...
def start_bot(message):
global user_info
#--------creating new user or load old user data--------
user = user_info[message.from_user.id]
...
Note that I used message.from_user.id rather then message.chat.id because for messages net in groups chats, message.chat will be the group chat, while message.from_user will be information about the user who sent the message.
It may be that pyTelegramBotAPI has some built-in mechanism for storing user-related data, but I'm not very familiar with that library …