https://spaghetti-code.net/en/tags/python/ Recent content in Python on Spaghetti Code 🍝 https://spaghetti-code.net/images/og-default.png https://spaghetti-code.net/images/og-default.png Hugo -- 0.160.0 en Wed, 04 Nov 2026 00:00:00 +0000 https://spaghetti-code.net/en/posts/fundamentals/what-is-a-hash-table/ Wed, 04 Nov 2026 00:00:00 +0000 https://spaghetti-code.net/en/posts/fundamentals/what-is-a-hash-table/ A hash table turns a key into an array index in constant time, until two keys collide. How hashing, chaining, open addressing, and load factor actually work. https://spaghetti-code.net/en/posts/testing/test-doubles-explained/ Mon, 02 Nov 2026 00:00:00 +0000 https://spaghetti-code.net/en/posts/testing/test-doubles-explained/ Dummy, stub, spy, fake and mock: five test doubles that check different things. One Python class, tested all five ways, shows which to use in your next test. https://spaghetti-code.net/en/posts/fundamentals/regular-expressions-explained/ Wed, 28 Oct 2026 00:00:00 +0000 https://spaghetti-code.net/en/posts/fundamentals/regular-expressions-explained/ A regex engine doesn't scan the whole string at once. It walks the pattern token by token and backtracks on failure. How that works, and why it sometimes hangs. https://spaghetti-code.net/en/posts/fundamentals/utf-8-encoding-explained/ Tue, 20 Oct 2026 00:00:00 +0000 https://spaghetti-code.net/en/posts/fundamentals/utf-8-encoding-explained/ Unicode gives every character a number; UTF-8 turns that number into 1 to 4 bytes. Why string.length lies, and where real encoding bugs actually come from. https://spaghetti-code.net/en/posts/testing/what-is-tdd/ Sun, 18 Oct 2026 00:00:00 +0000 https://spaghetti-code.net/en/posts/testing/what-is-tdd/ Test-driven development means writing a failing test before the code, making it pass, then cleaning up. The red-green-refactor cycle, with a full Python kata. https://spaghetti-code.net/en/posts/fundamentals/recursion-explained/ Tue, 13 Oct 2026 00:00:00 +0000 https://spaghetti-code.net/en/posts/fundamentals/recursion-explained/ Recursion explained with real code: how the call stack and base case work, when it beats a loop, why Python and JS crash past a depth limit, and memoization. https://spaghetti-code.net/en/posts/clean-code/solid-principles-explained/ Sat, 10 Oct 2026 00:00:00 +0000 https://spaghetti-code.net/en/posts/clean-code/solid-principles-explained/ The SOLID principles are five rules for structuring classes so one change doesn't ripple everywhere. Each one shown with before-and-after Python code. https://spaghetti-code.net/en/posts/fundamentals/what-is-a-race-condition/ Fri, 09 Oct 2026 00:00:00 +0000 https://spaghetti-code.net/en/posts/fundamentals/what-is-a-race-condition/ A race condition happens when your code's result depends on timing you can't control. Where it hides in threads, async code, databases, and how to fix it. https://spaghetti-code.net/en/posts/python/python-decorators-explained/ Wed, 07 Oct 2026 00:00:00 +0000 https://spaghetti-code.net/en/posts/python/python-decorators-explained/ Python decorators explained with real examples: how the @ syntax works, functools.wraps, decorators with arguments, class-based decorators, and lru_cache. https://spaghetti-code.net/en/posts/fundamentals/why-0-1-plus-0-2-doesnt-equal-0-3/ Tue, 06 Oct 2026 00:00:00 +0000 https://spaghetti-code.net/en/posts/fundamentals/why-0-1-plus-0-2-doesnt-equal-0-3/ Floating point cannot store most decimals exactly, so 0.1 + 0.2 returns 0.30000000000000004 instead of 0.3. Why that happens, and how to compare numbers safely. https://spaghetti-code.net/en/posts/fundamentals/big-o-notation/ Sun, 04 Oct 2026 00:00:00 +0000 https://spaghetti-code.net/en/posts/fundamentals/big-o-notation/ Big O notation measured with real code: five functions timed as input grows, what the notation leaves out, and how to spot an accidental O(n^2) before it ships. https://spaghetti-code.net/en/posts/python/python-virtual-environments/ Wed, 30 Sep 2026 00:00:00 +0000 https://spaghetti-code.net/en/posts/python/python-virtual-environments/ What a Python virtual environment actually is, how to create one with venv or uv, manage dependencies with pip and pyproject.toml, and fix the common errors. https://spaghetti-code.net/en/posts/testing/unit-vs-integration-vs-end-to-end-tests/ Tue, 29 Sep 2026 00:00:00 +0000 https://spaghetti-code.net/en/posts/testing/unit-vs-integration-vs-end-to-end-tests/ Unit, integration, and end-to-end tests catch different bugs. One Flask sign-up tested at all three levels, with mocks vs fakes and why e2e tests go flaky.