from typing import TypeVar, Generic

_T = TypeVar("_T")

class Box(Generic[_T]):
    def __init__(self, v: _T):
        self.v = v
    
    def get(self) -> _T:
        return self.v


boxedint = Box(1234)
intval = boxedint.get()

boxedstr = Box("foo")
strval = boxedstr.get()