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Learn Python Path.walk to traverse directories, prune folders, handle errors and symlinks, calculate sizes, delete safely, and support older versions.

Learn Python asyncio.timeout for deadlines, timeout_at, rescheduling, TaskGroup, cleanup, retries, shielding, and safe asynchronous cancellation.

Learn Python TaskGroup for structured concurrency, task results, cancellation, ExceptionGroup, timeouts, nested groups, and bounded async work.

Learn Python MappingProxyType to expose read-only dictionaries, create dynamic views and snapshots, preserve invariants, and avoid unnecessary copies.

Learn Python Literal to restrict exact values, create overloads, discriminate TypedDict variants, use match/case, and improve typed APIs.

Learn Python TypedDict for typed dictionaries, optional keys, NotRequired, Required, API payloads, discriminated variants, and static safety.

Learn Python Protocol for structural typing, generic contracts, callbacks, runtime_checkable, testing, dependency injection, and low coupling.

Learn Python memoryview for zero-copy buffers, slices, writable bytearray data, cast, mmap, struct, sockets, and safe lifecycle management.