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Fix Python ImportError: Circular Imports, Shadowed Stdlib Modules, ModuleNotFoundError and Running Scripts in Packages

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Self-Hosting & Infra beginner 5 min read $0.01 Updated 2026-10-20

Reproduced import problems: circular import ImportError and the lazy-import fix, a local json.py shadowing the stdlib, ModuleNotFoundError, cannot import name, running a file inside a package versus python -m, and namespace packages.

ModuleNotFoundError, "partially initialized module", or json suddenly has no dumps. Find out which file Python actually imported, break import cycles, and run package code with python -m.

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