Python
Learn how to use Python's built-in sqlite3 module like a pro: parameterized queries, transactions, Row factories, bulk inserts, WAL mode, and the pitfalls that trip up even experienced developers.
Python
Exception handling separates robust Python programs from fragile scripts. A practical tour of try/except/else/finally, custom exception hierarchies, chaining, and the patterns that keep failures debuggable.
Python
Learn how to run external commands from Python the right way: subprocess.run() essentials, capturing output, handling errors and timeouts, streaming with Popen, building pipelines, and avoiding the shell=True injection trap.
Python
Learn how to run work in parallel with Python's concurrent.futures — when to reach for threads vs. processes, how to use ThreadPoolExecutor and ProcessPoolExecutor, and how to handle results, exceptions, and timeouts cleanly.
Python
Learn how to replace fragile magic numbers and string constants with Python's enum module — covering Enum, IntEnum, StrEnum, Flag, auto(), custom methods, aliases, the @unique decorator, and the pitfalls to avoid.
Python
Learn to handle dates and times correctly in Python: naive vs. aware datetimes, converting between time zones with the standard-library zoneinfo, parsing and formatting, safe arithmetic, and the DST pitfalls that bite real applications.
Python
Learn Python's re module from the ground up: search vs. match, groups and named captures, substitution with functions, lookarounds, flags, and the pitfalls that trip up almost everyone.
Python
Go beyond switch statements. Learn how Python's match/case destructures sequences, mappings, and objects — with capture patterns, class patterns, guards, and the pitfalls that trip people up.
Python
Go beyond `assert` and learn pytest the way professionals use it: clean fixtures for setup and teardown, parametrization to kill duplicated tests, and monkeypatch/mock to isolate code from the network and filesystem.
Python
A hands-on guide to creating, styling, and batch-generating QR codes in Python with the qrcode library — from a one-liner to production-ready output.
Python
Learn how Python's asyncio really works — from the event loop and coroutines to gather, TaskGroup, timeouts, semaphores, and running blocking code without freezing your program.
Python
Learn how to turn a Python script into a polished command-line tool with argparse — positional and optional arguments, types and validation, flags, subcommands, and the pitfalls that trip people up.