Re: A Single Instance of an Object?

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Good question Rambius!
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On 12/03/24 09:53, Ivan "Rambius" Ivanov via Python-list wrote:

Hello,
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I am refactoring some code and I would like to get rid of a global
variable. Here is the outline:
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import subprocess
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CACHE = {}

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First thought: don't reinvent-the-wheel, use lru_cache
(https://docs.python.org/3/library/functools.html)
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The global cache variable made unit testing of the lookup(key) method
clumsy, because I have to clean it after each unit test. I refactored
it as:
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class Lookup:
     def __init__(self):
         self.cache = {}
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Change "cache" to be a class-attribute (it is currently an instance.
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Then, code AFTER the definition of Lookup can refer to Lookup.cache,
regardless of instantiation, and code within Lookup can refer to
self.cache as-is...
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