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cython

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cython
The most widely used Python to C compiler

Cython · 10840 stars
cython-shootout
Cython code for the Computer Language Benchmark Game

Python · 15 stars
cython.github.io
cython.org

HTML · 9 stars
emacs-cython-mode

Emacs Lisp · 7 stars

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1352 open issues indexed

Cython calls ExtType.__init__() as Python function Open

enhancement Optimization

cython/cython#560 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
req: support cdef class attrib initialisation Open

Code Generation enhancement

cython/cython#575 · 7 comments · 3 reactions · 0 assignees · Indexed Sep 15, 2026
Inefficient comparison code generation Open

enhancement Optimization

cython/cython#602 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Buffer utility functions Open

Code Generation enhancement P: minor

cython/cython#614 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Make CloneNode obsolete Open

cleanup Code Generation defect

cython/cython#641 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
pxd caching Open

Build System defect

cython/cython#650 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
public enums in extern blocks Open

defect Parsing

cython/cython#653 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
public and readonly module globals Open

Cython Language Feature feature

cython/cython#656 · 8 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
module dictionaries not deallocated at Python finalization Open

defect Memory Leak

cython/cython#701 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
subtyping PyVarObject (e.g. bytes/tuple) Open

Code Generation defect

cython/cython#711 · 4 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
safe, ref-counted support for dynamic memory allocation Open

enhancement Pure Python Mode

cython/cython#712 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
per-interpreter module state in Py3 (PEP 3121) Open

Code Generation enhancement

cython/cython#732 · 3 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
slow code Open

Code Generation defect

cython/cython#733 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Efficient cdef calling convention for buffers Open

Code Generation enhancement

cython/cython#736 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Optimize buffer assignments Open

defect numerics Optimization P: minor

cython/cython#739 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Inline iterator utility functions Open

enhancement Optimization P: minor

cython/cython#676 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Support for buffer typedefs Open

enhancement numerics P: minor Parsing

cython/cython#754 · 0 comments · 7 reactions · 0 assignees · Indexed Sep 15, 2026
Think through and clean up various TempBlock classes Open

cleanup Code Generation task

cython/cython#757 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
support __new__() in extension types Open

Code Generation enhancement

cython/cython#799 · 8 comments · 3 reactions · 0 assignees · Indexed Sep 15, 2026
for..from by step doesn't work with pointers Open

Code Generation defect

cython/cython#817 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
pre-declaring a cdef class without its base type doesn't raise an error Open

defect P: minor Parsing

cython/cython#822 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
explore ways to trap SIGFPE instead of doing runtime checks Open

Code Generation enhancement

cython/cython#842 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
method aliasing via assignment Open

Code Generation enhancement P: minor

cython/cython#849 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Garbage in HTML/annotation in simple example code Open

Code Generation defect P: minor

cython/cython#853 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Enable for-in-range optimisation also for untyped loop vars Open

Code Generation defect

cython/cython#858 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Buffers: Clean up internal representation of acquired buffers Open

Code Generation task

cython/cython#859 · 8 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Buffers: Acquire through coercion Open

Code Generation task

cython/cython#861 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Buffers: Store acquired buffers as typed fields in cdef classes + global variables Open

defect numerics Parsing

cython/cython#862 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Usability problem: Cannot access .shape member of numpy.ndarray as tuple Open

defect numerics Parsing

cython/cython#863 · 12 comments · 2 reactions · 0 assignees · Indexed Sep 15, 2026
Buffers: Acquisition counted buffers Open

Code Generation enhancement

cython/cython#871 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
ValueError Exception raised during type checking when mixing bint and ndarray Open

Code Generation defect P: minor

cython/cython#875 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Type checking when casting objects to pointers Open

defect P: minor Type Analysis

cython/cython#880 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Allow conditional compilation environment in distutils Open

Build System enhancement

cython/cython#883 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
use -ansi flag for runtests Open

defect P: minor Testing

cython/cython#892 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
misleading error message for buffer types Open

defect Error Reporting

cython/cython#893 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
support duplicating cdef class fields in both pxd and pyx Open

defect Parsing

cython/cython#895 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
class decorators for cdef classes Open

Code Generation enhancement P: minor

cython/cython#898 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Problem with buffer/memview parsing strategy Open

defect Parsing

cython/cython#902 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Move Cython-language utility code inclusion to code generation phase Open

Code Generation defect

cython/cython#903 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Necessary refactoring of mangling methods in Symtab.py Open

Code Generation defect

cython/cython#907 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
warn on unpaired __cinit__ and __dealloc__ Open

defect Error Reporting

cython/cython#911 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Should extern typedefs require an explicit cast? Open

Code Generation defect

cython/cython#912 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Make sure we handle ob_type->tp_flags inheritance correctly Open

Code Generation task

cython/cython#926 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Unraisable exceptions should be a compile time error whenever possible Open

defect Error Reporting

cython/cython#933 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
cython -r recursive option broken Open

Build System defect

cython/cython#941 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Integrate "Fast numerical computations in Cython" paper into docs Open

defect Documentation

cython/cython#942 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Integrate "Cython Tutorial" paper into docs Open

defect Documentation

cython/cython#943 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Make complex number type from typedef float Open

enhancement P: minor Parsing

cython/cython#948 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Document the autotestdict directive (#387) Open

defect Documentation

cython/cython#950 · 8 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Temp handling in ForFromStatNode needs cleanup Open

Code Generation P: minor task

cython/cython#951 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026

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