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from textwrap import dedent
from dataclasses import dataclass

@dataclass
class Person:
    __instance = None

    name: str
    age: int
    role: str
    language: str

    def __new__(cls, *args, **kwargs):
        if cls.__instance is None:
            cls.__instance = super().__new__(cls)
        return cls.__instance

    def __str__(self) -> str:
        brief_description = dedent(
            f"""
            Hi, my name is {self.name} — I'm a {self.role} in {self.language}.
            I'm {self.age} years old and have been programming for over 1 year.
            Thank you for stopping by!
            """
        )
        return brief_description

def main() -> None:
    me = Person(name="Lev", age=17, role="Web developer", language="Python")
    print(me)


if __name__ == "__main__":
    main()
    # Hi, my name is Lev — I'm a Web developer in Python.
    # I'm 17 years old and have been programming for over 1 year.
    # Thank you for stopping by!