Cython 3.0 Checklist

[jbrockmendel]

Collecting TODOs for once we bump to cython3:

• use conditional nogil e.g. here
• change labels.shape[0] -> len(labels) e.g. groupbyL965
• update searchsorted usages to use fixed cython version
• Move Timestamp methods to _Timestamp, assuming Change default of "always_allow_keywords" directive to True cython/cython#3605 is merged
• in _libs.internals use from cpython.pyport cimport PY_SSIZE_T_MAX instead of cdef extern ...
• in _libs.util use from numpy cimport PyArray_CLEARFLAGS, NPY_ARRAY_C_CONTIGUOUS, NPY_ARRAY_F_CONTIGUOUS instead of cdef extern ...
• in _libs.parsers use from cpython.unicode cimport PyUnicode_FromString instead of cdef extern ...
• in tslibs.parsing replace PyObject_Str with str (xref Optimize builtin str calls cython/cython#3478)
• from numpy cimport NPY_DATETIMEUNIT
• Audit usages of arg : datetime annotations in tslibs. Can interfere with non-nano usages of Timestamp (xref DEBUG: CY3 test_add_out_of_pydatetime_range #54169)

@WillAyd am i missing anything (const object[:]?)? If so, go ahead and edit the OP.

[rainwoodman]

@jbrockmendelor @WillAyd Could any of you post an update of the current the status of the cython 3.0 support?

I'd like to work on this but would like to avoid running into duplicated work.

Also, which language level of cython are we currently on (2 or 3, or 3str)?

[jbrockmendel]

Could any of you post an update of the current the status of the cython 3.0 support?

nothing really to do at the moment; we'll revisit once cython 3.0 is released

Also, which language level of cython are we currently on (2 or 3, or 3str)?

exclusively 3