Deprecation Warning Decorator

import functools
import warnings

def deprecated(reason: str = "", *, replacement: str | None = None):
    def decorator(fn):
        msg = f"{fn.__qualname__}() is deprecated"
        if replacement: msg += f" — use {replacement}() instead"
        if reason:      msg += f"  ({reason})"

        @functools.wraps(fn)
        def wrapper(*args, **kwargs):
            warnings.warn(msg, DeprecationWarning, stacklevel=2)
            return fn(*args, **kwargs)
        return wrapper
    return decorator

@deprecated("renamed for clarity", replacement="connect_db")
def open_db():
    pass

open_db()
# DeprecationWarning: open_db() is deprecated — use connect_db() instead (renamed for clarity)