Brandon Rozek

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PhD Student @ RPI studying Automated Reasoning in AI and Linux Enthusiast.

Quick Python: Cached Property

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If you have a property in an object that only needs to be computed once, consider using cached_property to store the result and serve for future function calls.

import functools
class Number:
    def __init__(self, n):
        self.n = n
    def is_prime(self):
    	return all(self.n % i for i in range(2, self.n))

Let’s test it with the Mersenne prime 524287.

n = Number(524287)

After maybe 1-2 seconds of thinking you should get True.

Run it again and the result will be instantaneous!

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