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Learn Python linecache to retrieve source lines, refresh cached files, support tracebacks and loaders, preserve indentation, and secure paths.

Learn Python faulthandler to diagnose crashes, deadlocks, fatal signals, timeouts, and hangs with stack dumps from every thread.

Learn Python symtable to analyze scopes, locals, globals, parameters, imports, nonlocals, closures, and compiler namespaces.

Learn Python dis to inspect bytecode instructions, jumps, stack effects, adaptive caches, and optimizations without relying on unstable internals.

Learn Python tokenize to read tokens, comments, encodings, indentation, and positions, then transform and rebuild source safely.

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.