Re: A Single Instance of an Object?

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

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

First thought: don't reinvent-the-wheel, use lru_cache (https://docs.python.org/3/library/functools.html)

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:
 class Lookup:
     def __init__(self):
         self.cache = {}
 

Change "cache" to be a class-attribute (it is currently an instance.
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...
--
Regards,
=dn