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Learn Python zipapp to build .pyz files, define entry points, bundle pure dependencies, handle resources, and distribute secure CLI tools.

Learn Python sysconfig to inspect paths, schemes, headers, compiler flags, ABI details, native extensions, and virtual environments.

Learn Python marshal for internal objects and bytecode, including versions, allow_code, disposable caches, limits, and untrusted-input risks.

Learn Python copyreg to customize pickle reducers, version serialized state, avoid global conflicts, and test safely across processes.

Learn Python reprlib to summarize large lists, strings, and recursive objects while keeping logs safe, bounded, and readable.

Learn Python graphlib to order dependencies, detect cycles, run ready tasks in parallel, and build safe task pipelines.

Learn Python weakref for weak references, caches, WeakSet, WeakMethod, finalize callbacks, and avoiding accidental object retention.

Learn Python contextlib with contextmanager, ExitStack, suppress, closing, asynccontextmanager, and safe resource cleanup.