Astropy: Cython FutureWarning language_level not set
When I installed Astropy 3.2.dev23273 on Windows 10, Python 3.7.1 [MSC v.19124)], and Cython 0.29, I see the following warning. This is just one of them. This seems to affect multiple sub-packages.
C:\...\Cython\Compiler\Main.py:367:FutureWarning:
Cython directive 'language_level' not set, using 2 for now (Py2).
This will change in a later release!
File: C:\...\astropy\astropy\table\_np_utils.pyx
Perhaps this is related to cython/cython#2565. Do we need to do anything on our side?
pllim
All 3 comments
This is a new warning from Cython 0.29: https://cython.readthedocs.io/en/latest/src/changes.html#id7
I guess we could safely use language_level=3 (https://cython.readthedocs.io/en/latest/src/userguide/source_files_and_compilation.html#compiler-options).
saimn
on 9 Nov 2018
👍5
PR to include this in 3.1?
bsipocz
on 10 Nov 2018
I'm on it. See #8106 for my attempt.
pllim
on 10 Nov 2018
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Most helpful comment
This is a new warning from Cython 0.29: https://cython.readthedocs.io/en/latest/src/changes.html#id7
I guess we could safely use
language_level=3(https://cython.readthedocs.io/en/latest/src/userguide/source_files_and_compilation.html#compiler-options).