定义类与实例化

class User:
   def __init__(self, name: str, age: int):
       self.name = name
       self.age = age
   def greet(self) -> str:
       return f"Hi, I'm {self.name}"
   def __repr__(self) -> str:
       return f"User(name={self.name!r}, age={self.age})"

u = User("Tom", 20)
print(u.greet())

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