https://mhbxyz.github.io/en/tags/functional-programming/Recent content in Functional Programming on mhbxyz.meHugoenFri, 06 Feb 2026 00:00:00 +0000https://mhbxyz.github.io/en/articles/fptk-make-errors-explicit-in-a-python-api/Fri, 06 Feb 2026 00:00:00 +0000https://mhbxyz.github.io/en/articles/fptk-make-errors-explicit-in-a-python-api/<h2 id="the-problem-is-not-exceptions">The problem is not exceptions</h2> <p>An API request goes through several steps: decode JSON, validate input, write to a database, then build a response. Each step can fail. In Python, we can let exceptions rise and catch them at the end. That works, but a function&rsquo;s signature does not tell us which operations can produce an expected failure. We may end up with one large <code>try/except</code> around the whole request, without a clear idea of what it catches.</p>