Python Telegram Bot

from telegram import Bot, Update
from telegram.ext import Application, ApplicationBuilder

from telegram import Bot
from telegram.ext import Application, CommandHandler, MessageHandler, filters

import asyncio
from telegram import Update
from telegram.ext import Application, CommandHandler, ContextTypes

async def start(update: Update, context: ContextTypes.DEFAULT_TYPE) -> None:
    """Send a message when the command /start is issued."""
    await update.message.reply_text('Hi! I am your bot.')

async def echo(update: Update, context: ContextTypes.DEFAULT_TYPE) -> None:
    """Echo the user message."""
    await update.message.reply_text(update.message.text)

def main() -> None:
    """Start the bot."""
    # Create the Application and pass it your bot's token
    application = Application.builder().token("YOUR_BOT_TOKEN").build()

    # Register handlers
    application.add_handler(CommandHandler("start", start))
    application.add_handler(MessageHandler(filters.TEXT & ~filters.COMMAND, echo))

    # Run the bot until you press Ctrl-C
    application.run_polling()

if __name__ == '__main__':
    main()

class Bot:
    def __init__(self, token: str, **kwargs): ...
    async def send_message(self, chat_id: int | str, text: str, **kwargs) -> Message: ...
    async def send_photo(self, chat_id: int | str, photo: InputFile | str, **kwargs) -> Message: ...
    async def get_updates(self, **kwargs) -> list[Update]: ...
    async def get_me() -> User: ...

class Application:
    def add_handler(self, handler: BaseHandler) -> None: ...
    def run_polling(self, **kwargs) -> None: ...
    def run_webhook(self, **kwargs) -> None: ...
    
class ApplicationBuilder:
    def token(self, token: str) -> 'ApplicationBuilder': ...
    def build() -> Application: ...

class CommandHandler(BaseHandler):
    def __init__(self, command: str, callback: callable, **kwargs): ...

class MessageHandler(BaseHandler):
    def __init__(self, filters: BaseFilter, callback: callable, **kwargs): ...

class CallbackQueryHandler(BaseHandler):
    def __init__(self, callback: callable, **kwargs): ...

class Update:
    message: Message | None
    callback_query: CallbackQuery | None
    inline_query: InlineQuery | None

class Message:
    message_id: int
    from_user: User | None
    chat: Chat
    text: str | None
    
class User:
    id: int
    is_bot: bool
    first_name: str
    username: str | None

class ReplyKeyboardMarkup:
    def __init__(self, keyboard: list[list[KeyboardButton]], **kwargs): ...

class InlineKeyboardMarkup:
    def __init__(self, inline_keyboard: list[list[InlineKeyboardButton]]): ...

class KeyboardButton:
    def __init__(self, text: str, **kwargs): ...

class InlineKeyboardButton:
    def __init__(self, text: str, **kwargs): ...

class InputFile:
    def __init__(self, obj: BinaryIO | bytes | str): ...

class File:
    file_id: str
    file_unique_id: str
    file_path: str | None
    async def download_to_drive(self, custom_path: str = None) -> str: ...

class filters:
    TEXT: MessageFilter
    COMMAND: MessageFilter
    PHOTO: MessageFilter
    VIDEO: MessageFilter
    ALL: UpdateFilter

class JobQueue:
    def run_once(self, callback: callable, when: float, **kwargs) -> Job: ...
    def run_repeating(self, callback: callable, interval: float, **kwargs) -> Job: ...

class PicklePersistence(BasePersistence):
    def __init__(self, filepath: str, **kwargs): ...

class TelegramError(Exception):
    """Base class for all Telegram errors."""
    def __init__(self, message: str): ...

class NetworkError(TelegramError):
    """Base class for exceptions due to networking errors."""

class BadRequest(NetworkError):
    """Raised when Telegram could not process the request correctly."""

class Forbidden(TelegramError):
    """Raised when the bot has not enough rights to perform the requested action."""

class TimedOut(NetworkError):
    """Raised when a request took too long to finish."""

class InvalidToken(TelegramError):
    """Raised when the token is invalid."""

class ChatMigrated(TelegramError):
    """Raised when group chat migrated to supergroup."""
    def __init__(self, new_chat_id: int): ...
    new_chat_id: int

class RetryAfter(TelegramError):
    """Raised when flood limits were exceeded."""
    def __init__(self, retry_after: int): ...
    retry_after: int

class Conflict(TelegramError):
    """Raised when a long poll or webhook conflicts with another one."""

class EndPointNotFound(TelegramError):
    """Raised when the requested endpoint is not found."""

class PassportDecryptionError(TelegramError):
    """Something went wrong with decryption."""

from telegram.error import (
    TelegramError, BadRequest, Forbidden, TimedOut, 
    NetworkError, ChatMigrated, RetryAfter
)

# Basic error handling
try:
    await bot.send_message(chat_id, "Hello!")
except BadRequest as e:
    print(f"Bad request: {e}")
except Forbidden as e:
    print(f"Bot blocked or insufficient permissions: {e}")
except TimedOut as e:
    print(f"Request timed out: {e}")
except NetworkError as e:
    print(f"Network error: {e}")
except TelegramError as e:
    print(f"Other Telegram error: {e}")

# Handling specific scenarios
try:
    await bot.send_message(chat_id, "Hello!")
except ChatMigrated as e:
    # Update chat_id and retry
    new_chat_id = e.new_chat_id
    await bot.send_message(new_chat_id, "Hello!")
except RetryAfter as e:
    # Wait and retry
    import asyncio
    await asyncio.sleep(e.retry_after)
    await bot.send_message(chat_id, "Hello!")

from telegram import constants
from telegram.helpers import escape_markdown, mention_html

# Constants
max_message_length = constants.MessageLimit.MAX_TEXT_LENGTH
parse_mode = constants.ParseMode.MARKDOWN_V2

# Helpers
escaped_text = escape_markdown("Text with *special* characters")
user_mention = mention_html(user.id, user.first_name)