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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.

Learn Python tracemalloc to measure peaks, create and compare snapshots, filter allocations, and diagnose memory growth and leaks.

Learn Python queue for thread communication with FIFO, LIFO, priority, backpressure, task tracking, sentinels, and safe shutdown.

Learn Python selectors to multiplex sockets, handle partial reads and writes, manage buffers, deadlines, wakeups, and backpressure.