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29 lines
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679 B
Markdown
29 lines
No EOL
679 B
Markdown
---
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title: "Quick Python: Cached Property"
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date: 2020-04-18T18:29:21-04:00
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draft: false
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tags: ["python"]
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---
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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.
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```python
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import functools
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class Number:
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def __init__(self, n):
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self.n = n
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@functools.cached_property
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def is_prime(self):
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return all(self.n % i for i in range(2, self.n))
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```
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Let's test it with the Mersenne prime `524287`.
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```python
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n = Number(524287)
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n.is_prime
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```
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After maybe 1-2 seconds of thinking you should get `True.`
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Run it again and the result will be instantaneous! |