Calculate property only once and use the result several times (different approaches)

1. Try/except is simple and readable, but one day you would want to cache another property, right? So one day you will write your own cached property probably.

2. lru_cache it is a good idea to use standard library, but as you don't need lru cache, it is an overhead probably.

3. Django's cache_property works exactly as you want and it is pretty simple. It has analogue in werkzeug (so Flask users familiar with it too), it is easy to find a sources, so probably it is a good choice for you.

Python 3.8 update: You can now use functools.cached_property

from functools import cached_property

class Test:
    def __init__(self, *args):
        # do stuff

    @cached_property
    def new_method(self):
        # do some heavy calculations
        return self._new_property