On Thu, 23 Aug 2018 08:07:08 +0200 Jeroen Demeyer <j.deme...@ugent.be> wrote: > > > - the dependency / versioning problem (Cython is a large quick-evolving > > third-party package that we can't decently vendor) > > Is that a real problem? You're sort of doing the same thing with pip > already.
Building and developing CPython doesn't depend on pip at all. The bundled pip copy is just an inert pack of files, as far as we are concerned. > > - the maintenance problem (how do ensure we can change small things in > > the C API, especially semi-private ones, without having to submit PRs > > to Cython as well) > > Why don't you want to submit PRs to Cython? Because it forces a much longer cycle time when we want to introduce a change in the C API: first prototype the C API change, then notice it breaks Cython, then try to make a PR (which isn't trivial, given Cython's size), then wait for the PR to be merged and a new Cython to be released. > If you're saying "I don't > want to wait for the next stable release of Cython", you could use > development versions of Cython for development versions of CPython. But depending on the development version of a compiler isn't very enticing, IMHO. > > - the debugging problem (Cython's generated C code is unreadable, > > unlike Argument Clinic's, which can make debugging annoying) > > Luckily, you don't need to read the C code most of the time. And it's > also a matter of experience: I can read Cython-generated C code just fine. Let's be serious here. Regardless of the experience, nobody enjoys reading / stepping through code like the following: __Pyx_TraceLine(206,0,__PYX_ERR(1, 206, __pyx_L1_error)) __Pyx_XDECREF(__pyx_r); __pyx_t_2 = __Pyx_GetModuleGlobalName(__pyx_n_s_datetime); if (unlikely(!__pyx_t_2)) __PYX_ERR(1, 206, __pyx_L1_error) __Pyx_GOTREF(__pyx_t_2); __pyx_t_3 = __Pyx_PyObject_GetAttrStr(__pyx_t_2, __pyx_n_s_datetime); if (unlikely(!__pyx_t_3)) __PYX_ERR(1, 206, __pyx_L1_error) __Pyx_GOTREF(__pyx_t_3); __Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0; __pyx_t_2 = __Pyx_PyObject_GetAttrStr(__pyx_t_3, __pyx_n_s_utcfromtimestamp); if (unlikely(!__pyx_t_2)) __PYX_ERR(1, 206, __pyx_L1_error) __Pyx_GOTREF(__pyx_t_2); __Pyx_DECREF(__pyx_t_3); __pyx_t_3 = 0; __pyx_t_3 = __Pyx_PyFloat_DivideObjC(__pyx_v_x, __pyx_float_1e3, 1e3, 0); if (unlikely(!__pyx_t_3)) __PYX_ERR(1, 206, __pyx_L1_error) __Pyx_GOTREF(__pyx_t_3); __pyx_t_4 = NULL; if (CYTHON_UNPACK_METHODS && likely(PyMethod_Check(__pyx_t_2))) { __pyx_t_4 = PyMethod_GET_SELF(__pyx_t_2); if (likely(__pyx_t_4)) { PyObject* function = PyMethod_GET_FUNCTION(__pyx_t_2); __Pyx_INCREF(__pyx_t_4); __Pyx_INCREF(function); __Pyx_DECREF_SET(__pyx_t_2, function); } } if (!__pyx_t_4) { __pyx_t_1 = __Pyx_PyObject_CallOneArg(__pyx_t_2, __pyx_t_3); if (unlikely(!__pyx_t_1)) __PYX_ERR(1, 206, __pyx_L1_error) __Pyx_DECREF(__pyx_t_3); __pyx_t_3 = 0; __Pyx_GOTREF(__pyx_t_1); } else { #if CYTHON_FAST_PYCALL if (PyFunction_Check(__pyx_t_2)) { PyObject *__pyx_temp[2] = {__pyx_t_4, __pyx_t_3}; __pyx_t_1 = __Pyx_PyFunction_FastCall(__pyx_t_2, __pyx_temp+1-1, 1+1); if (unlikely(!__pyx_t_1)) __PYX_ERR(1, 206, __pyx_L1_error) __Pyx_XDECREF(__pyx_t_4); __pyx_t_4 = 0; __Pyx_GOTREF(__pyx_t_1); __Pyx_DECREF(__pyx_t_3); __pyx_t_3 = 0; } else #endif #if CYTHON_FAST_PYCCALL if (__Pyx_PyFastCFunction_Check(__pyx_t_2)) { PyObject *__pyx_temp[2] = {__pyx_t_4, __pyx_t_3}; __pyx_t_1 = __Pyx_PyCFunction_FastCall(__pyx_t_2, __pyx_temp+1-1, 1+1); if (unlikely(!__pyx_t_1)) __PYX_ERR(1, 206, __pyx_L1_error) __Pyx_XDECREF(__pyx_t_4); __pyx_t_4 = 0; __Pyx_GOTREF(__pyx_t_1); __Pyx_DECREF(__pyx_t_3); __pyx_t_3 = 0; } else #endif { __pyx_t_5 = PyTuple_New(1+1); if (unlikely(!__pyx_t_5)) __PYX_ERR(1, 206, __pyx_L1_error) __Pyx_GOTREF(__pyx_t_5); __Pyx_GIVEREF(__pyx_t_4); PyTuple_SET_ITEM(__pyx_t_5, 0, __pyx_t_4); __pyx_t_4 = NULL; __Pyx_GIVEREF(__pyx_t_3); PyTuple_SET_ITEM(__pyx_t_5, 0+1, __pyx_t_3); __pyx_t_3 = 0; __pyx_t_1 = __Pyx_PyObject_Call(__pyx_t_2, __pyx_t_5, NULL); if (unlikely(!__pyx_t_1)) __PYX_ERR(1, 206, __pyx_L1_error) __Pyx_GOTREF(__pyx_t_1); __Pyx_DECREF(__pyx_t_5); __pyx_t_5 = 0; } } Regards Antoine. _______________________________________________ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com