See 
https://trac.sagemath.org/wiki/ReleaseTours/sage-9.7#sagesage.ringssage.libs...arenowPEP420namespacepackages
and https://trac.sagemath.org/ticket/34221


On Tuesday, August 16, 2022 at 3:42:34 AM UTC-7 Marc Mezzarobba wrote:

> Hi everyone,
>
> Some external packages that cimport cython modules from sage no
> longer build with sage 9.7.beta8. It looks like this is due to
> some recent change in Sage, as is reportedly works with sage 9.6.
>
> Two examples:
>
> ~/co/sage:develop$ ./sage -pip install sage-flatsurf
> Collecting sage-flatsurf
> Using cached sage_flatsurf-0.4.7-py3-none-any.whl (206 kB)
> Collecting surface-dynamics
> Using cached surface_dynamics-0.4.7.tar.gz (8.3 MB)
> Preparing metadata (setup.py) ... error
> error: subprocess-exited-with-error
>
> × python setup.py egg_info did not run successfully.
> │ exit code: 1
> ╰─> [337 lines of output]
> /home/marc/co/sage/local/var/lib/sage/venv-python3.10/lib/python3.10/site-packages/Cython/Compiler/Main.py:369:
>  
> FutureWarning: Cython directive 'language_level' not set, using 2 for now 
> (Py2). This will change in a later release! File: 
> /tmp/pip-install-2fum1bmr/surface-dynamics_04b48bb6529e4830942d5ec0e4b492bb/surface_dynamics/flat_surfaces/origamis/origami_dense.pxd
> tree = Parsing.p_module(s, pxd, full_module_name)
>
> Error compiling Cython file:
> ------------------------------------------------------------
> ...
> # Otherwise we end up with the strange error
> # sage: from .origami import Origami
> # Traceback (most recent call last):
> # ...
> # AttributeError: 'module' object has no attribute 
> 'ModuleElementWithMutability'
> cimport sage.structure.element
> ^
> ------------------------------------------------------------
>
> surface_dynamics/flat_surfaces/origamis/origami_dense.pyx:39:8: 
> 'sage/structure/element.pxd' not found
> [...] 
> File 
> "/home/marc/co/sage/local/var/lib/sage/venv-python3.10/lib/python3.10/site-packages/Cython/Build/Dependencies.py",
>  
> line 1250, in cythonize_one
> raise CompileError(None, pyx_file)
> Cython.Compiler.Errors.CompileError: 
> surface_dynamics/flat_surfaces/origamis/origami_dense.pyx
> Adding extension surface_dynamics.flat_surfaces.origamis.origami_dense:
> sources = ['origami_dense.pyx', 'normal_form.c', 'lyapunov_exponents.c']
> headers = ['origami_dense.pxd', 'lyapunov_exponents.h', 'normal_form.h']
> Adding extension surface_dynamics.interval_exchanges.lyapunov_exponents:
> sources = ['lyapunov_exponents.pyx', 'generalized_permutation.c', 
> 'lin_alg.c', 'quad_cover.c', 'random.c', 'permutation.c']
> headers = ['lyapunov_exponents.h']
> Adding extension surface_dynamics.interval_exchanges.integer_iet:
> sources = ['integer_iet.pyx', 'int_iet.c', 'int_vector.c']
> headers = ['integer_iet.pxd', 'int_iet.h']
> Adding extension surface_dynamics.interval_exchanges.iet_family:
> sources = ['iet_family.pyx']
> headers = []
> Compiling surface_dynamics/flat_surfaces/origamis/origami_dense.pyx 
> because it changed.
> Compiling surface_dynamics/interval_exchanges/lyapunov_exponents.pyx 
> because it changed.
> Compiling surface_dynamics/interval_exchanges/integer_iet.pyx because it 
> changed.
> Compiling surface_dynamics/interval_exchanges/iet_family.pyx because it 
> depends on 
> /home/marc/co/sage/local/var/lib/sage/venv-python3.10/lib/python3.10/site-packages/ppl/ppl_decl.pxd.
> [1/4] Cythonizing surface_dynamics/flat_surfaces/origamis/origami_dense.pyx
> [end of output]
>
> note: This error originates from a subprocess, and is likely not a problem 
> with pip.
> error: metadata-generation-failed
>
> × Encountered error while generating package metadata.
> ╰─> See above for output.
>
> note: This is an issue with the package mentioned above, not pip.
> hint: See above for details.
> (exit 1)
>
> or:
>
> ~/co/sage:develop$ ./sage -pip install git+
> https://github.com/mkauers/ore_algebra.git
> Collecting git+https://github.com/mkauers/ore_algebra.git
> Cloning https://github.com/mkauers/ore_algebra.git to 
> /tmp/pip-req-build-r3prw8dd
> Running command git clone --filter=blob:none --quiet 
> https://github.com/mkauers/ore_algebra.git /tmp/pip-req-build-r3prw8dd
> Resolved https://github.com/mkauers/ore_algebra.git to commit 
> 47e05a4556c854847f0ed9239fc3e288fde28ab3
> Preparing metadata (setup.py) ... error
> error: subprocess-exited-with-error
>
> × python setup.py egg_info did not run successfully.
> │ exit code: 1
> ╰─> [1582 lines of output]
>
> Error compiling Cython file:
> ------------------------------------------------------------
> ...
> # Distributed under the terms of the GNU General Public License (GPL) 
> either
> # version 2, or (at your option) any later version
> #
> # http://www.gnu.org/licenses/
>
> from sage.libs.arb.types cimport *
> ^
> ------------------------------------------------------------
>
> src/ore_algebra/analytic/binary_splitting_arb.pyx:16:0: 
> 'sage/libs/arb/types.pxd' not found
> [...]
> Cython.Compiler.Errors.CompileError: 
> src/ore_algebra/analytic/binary_splitting_arb.pyx
> Compiling src/ore_algebra/analytic/binary_splitting_arb.pyx because it 
> changed.
> Compiling src/ore_algebra/analytic/eval_poly_at_int.pyx because it changed.
> Compiling src/ore_algebra/analytic/naive_sum_c.pyx because it changed.
> [1/3] Cythonizing src/ore_algebra/analytic/binary_splitting_arb.pyx
> [end of output]
> [...]
>
> Does anyone know what the issue might be?
>
> Thanks,
>
> -- 
> Marc
>
>

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