sys.modules, finders, loaders.
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How does the Python import system work?
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importmodules
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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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PYRe-import hits the cache; top-level runs once
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Dossier 93 of 120 decoded in the Python track. One more won't hurt.