Upcoming Cython 3.1 str <-> bytes errors

[greglucas]

Building with the latest Cython nightly wheel causes errors with strings that are expected to be bytes and vice-versa. I'm not sure if this is due to an implicit cast that was removed somewhere or something else. My guess is this may be related to: cython/cython#6374

pip install --upgrade --pre --only-binary :all: -i https://pypi.anaconda.org/scientific-python-nightly-wheels/simple cython numpy
pip install .
python -m pytest

Problem description

____________________________________________________ ERROR collecting test/crs/test_crs.py ____________________________________________________
test/crs/test_crs.py:1670: in <module>
    CRS("EPSG:4979"),  # native 3D
pyproj/crs/crs.py:350: in __init__
    self._local.crs = _CRS(self.srs)
pyproj/_crs.pyx:2355: in pyproj._crs._CRS.__init__
    def __init__(self, const char *proj_string):
E   TypeError: expected bytes, str found
__________________________________________________ ERROR collecting test/test_datum_shift.py __________________________________________________
test/test_datum_shift.py:30: in <module>
    WGS84_PROJ = Proj(proj="latlong", datum="WGS84")
pyproj/proj.py:110: in __init__
    self.crs = CRS.from_user_input(projparams, **kwargs)
pyproj/crs/crs.py:503: in from_user_input
    return cls(value, **kwargs)
pyproj/crs/crs.py:350: in __init__
    self._local.crs = _CRS(self.srs)
pyproj/_crs.pyx:2355: in pyproj._crs._CRS.__init__
    def __init__(self, const char *proj_string):
E   TypeError: expected bytes, str found

Expected Output

No TypeErrors

Installation method

from source

[snowman2]

Thanks for the report. Probably just need to wrap it in the cstrencode function.