lambdas.py

import functools
import typing

# Use a conditional expression directly. 
# This evaluates to the function 'cache' itself, which the @ operator then calls.
@ (functools.cache if not typing.TYPE_CHECKING else lambda f: f)
def a():
    print("Aaaa")

a()  # Prints "Aaaa"
a()  # Returns cached value, prints nothing