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Build a Flask REST API with SQLite using CRUD endpoints, parameterized SQL, validation, status codes, connection cleanup, pytest tests and production safeguards.

Build a practical sales analysis with pandas GroupBy, named aggregation and merge, including key validation, reconciliation, missing values and export checks.

Build a reliable Python Requests client with sessions, timeouts, status checks, retry backoff, page and cursor pagination, rate-limit handling and checkpoints.

Learn pytest unit testing with test discovery, assertions, fixtures, parametrization, exception tests, monkeypatching, coverage and practical project structure.

Learn to design Python custom exceptions for domain validation, exception hierarchies, error chaining, recovery boundaries, API responses and unit tests.

Learn Python context managers and the with statement for safe files, locks and database transactions, including custom classes and contextlib examples.

Learn Python decorators through closures, functools.wraps, logging, timing and configurable wrappers, with practical patterns and common mistakes.

Understand Python iterables, iterators, generators, yield, lazy file processing, generator expressions, one-pass behavior and practical pipeline design.

Learn Python list comprehensions with transformations, filters, conditional expressions, nested loops, dictionary and set comprehensions, and readability rules.