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pyTelegramBotAPI/telebot/asyncio_handler_backends.py

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class BaseMiddleware:
"""
Base class for middleware.
Your middlewares should be inherited from this class.
"""
def __init__(self):
pass
async def pre_process(self, message, data):
raise NotImplementedError
async def post_process(self, message, data, exception):
raise NotImplementedError
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class State:
def __init__(self) -> None:
self.name = None
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def __str__(self) -> str:
return self.name
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class StatesGroup:
def __init_subclass__(cls) -> None:
# print all variables of a subclass
for name, value in cls.__dict__.items():
if not name.startswith('__') and not callable(value) and isinstance(value, State):
# change value of that variable
value.name = ':'.join((cls.__name__, name))