Caching for special calls

Question

How can you change the behavior of the decorator lru_cache from functools so that the decorated function has a flag that indicates whether to cache this call or not.
for example

@new_lru_cache
def f(args, kwargs):
    ...body function...

f(1) # not saved
f(2, cache=True) # saved

Answer 1

If you are gonna write a whole function for it, why not copy-paste the original source and implement your logic there?

def lru_cache(maxsize=128, typed=False, cache=False):
    if isinstance(maxsize, int):
        if maxsize < 0:
            maxsize = 0
    elif callable(maxsize) and isinstance(typed, bool):
        user_function, maxsize = maxsize, 128
        wrapper = _lru_cache_wrapper(user_function, maxsize, typed, _CacheInfo)
        return update_wrapper(wrapper, user_function)
    elif maxsize is not None:
        raise TypeError('Expected first argument to be an integer, a callable, or None')

    def decorating_function(user_function):
        if not cache:
            return user_function # We add here
        wrapper = _lru_cache_wrapper(user_function, maxsize, typed, _CacheInfo)
        return update_wrapper(wrapper, user_function)

    return decorating_function

This way you have even more control over the function, and you can see everything easily, and you can play around with the inners of the functools this way.