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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.

Learn Python ast to analyze and transform source code, build visitors, preserve positions, use literal_eval, and avoid execution risks.

Learn Python socket for TCP and UDP clients and servers, framing, timeouts, IPv6, concurrency, TLS, and network security.

Learn Python multiprocessing with processes, pools, queues, pipes, shared memory, cancellation, security, and correct shutdown.

Learn Python concurrent.futures with threads, processes, Future objects, timeouts, cancellation, backpressure, and deadlock prevention.