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How does the Python import system work?

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01

Understand the problem

sys.modules, finders, loaders.

importmodules
02

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03

Study the solution

import checks the sys.modules cache first, then finders locate the module and a loader executes it once, caching the resulting module object.

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04

Run the code

PYRe-import hits the cache; top-level runs once
05

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Dossier 93 of 120 decoded in the Python track. One more won't hurt.

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