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Learn Python wsgiref to build and validate WSGI applications, test environ and headers, route requests, and run a local reference

Learn Python stringprep to apply RFC 3454 tables, map Unicode, reject prohibited characters, and validate bidirectional protocol rules.

Learn Python selectors to monitor many sockets, read and write readiness, timeouts, partial messages, and non-blocking connections safely.

Learn Python contextvars to store task-local state, prevent asyncio leaks, copy contexts, propagate metadata, and restore values with tokens.

Learn Python operator to use operations as functions, sort fields, access items, call methods, and build clear functional pipelines.

Learn Python unicodedata to normalize Unicode, inspect names, categories, numeric values, combining marks, bidirectional classes, and width.

Learn Python ExitStack to manage dynamic files, connections, callbacks, and cleanup safely in predictable reverse order.