About Caching Method Values

class SomeClass(object):
    def calc(self):
        if not hasattr(self, "_calc_cache"):
            self._calc_cache = ... # some heavy calculations
        return self._calc_cache

from functools import lru_cache

class SomeClass(object):
    @lru_cache(maxsize=None)
    def calc(self):
        return ...

from functools import cache

class SomeClass(object):
    @cache
    def calc(self):
        return ...