Wispik

message.text.isdigit() and
int(message.text) > 0
...

@dp.message_handler(commands=['start'])
async def start(message: types.Message):
    print(message.text)
    await message.reply('Добро пожаловать!')

def dec_arg(arg):

    def decorator(func):
        def wrapper(*args, **kwargs):
            res = func(dec_n=arg ,*args, **kwargs)
            return res
        return wrapper
    return decorator

@dec_arg(20)
def sqr(num, n, **kwargs):

    return (num**2 + kwargs['dec_n'])


print(sqr(1, 45))

def meth(self, var1=None): 
    if var1 is None:
        var1 = self.var1
    print(var1)

import re

s = '/event add birthdays "День рождения" "2022.09.30"'
regexp = r'/(\w+)\s(\w+)\s(\w+)\s\"([\w\s]+)\"\s\"([\d\.]+)'
result = re.match(regexp, s)
print(result.groups())

a = {
  "a": "1",
  "b": "2",
  "dict2": {
    "c": "3",
    "d": "4",
  }
}

def find_dict(d):
  for x, y in  d.items():
    if isinstance(y, dict):
      return x
  return None


print(find_dict(a))