Cython

Raised as a usability problem by 9 people on Hacker News over 17 years (2010–2026), in 9 threads.

People raised many different problems with Cython, but no single problem has yet been raised by 3 people in 3 different months and threads.

Unreviewed issues were grouped by machine: Claude Haiku labelled each comment as a usability complaint, named what it's about and summed up the problem in a line, and a small model grouped similar problems. Nobody has checked them by hand. Expect mistakes.

The newest 9 complaints

Mixing C footguns with Python features makes it a mess to use in practice2026-10-13
Mistakes with cdef declarations only show up by reading the compiled C output2024-05-13
Cython's error messages are hard to understand and unhelpful2022-06-10
Performance bottlenecks are opaque and hard to profile for beginners2022-04-04
Felt like half a language between Python and a static language, annoying to work with2021-04-19
Cython miscompiles metaclass code differently from Python, and the developers do not treat it as a bug2018-02-07
Making compiled functions handle complex numbers forces messy conditional compilation and non-Python syntax2017-10-14
Declaring functions nogil loses exception handling and the GIL behavior is confusing2014-10-20
No forward and back buttons to move between slides; page breaks web conventions2010-10-29