So, I was writing an event emitter class using Python.

Code currently looks like this:

```py
from typing import Callable, Generic, ParamSpec

P = ParamSpec('P')

class Event(Generic[P]):
  def __init__(self):
    ...

  def addHandler(self, action : Callable[P, None]):
    ...

  def removeHandler(self, action : Callable[P, None]): 
    ...

  def fire(self, *args : P.args, **kwargs : P.kwargs):
    ...

```

And while it works good in Python 3.10 (on my machine), it fails in Python 3.9 and older (on other machines) because `ParamSpec` is a new feature.

So, how could I not import `ParamSpec` when running program, while not confusing typing in editor (pyright)?