Upgrade to Cython 3

pysdd/compiler_c.pxd

@@ -6,7 +6,7 @@ __license__ = "APL"
 
 """
 
-cimport sddapi_c
+from . cimport sddapi_c
 
 cdef extern from "compiler.h":
     ctypedef struct SddCompilerOptions:

pysdd/fnf_c.pxd

@@ -7,8 +7,8 @@ pysdd.fnf_c
 :copyright: Copyright 2017-2018 KU Leuven and Regents of the University of California.
 :license: Apache License, Version 2.0, see LICENSE for details.
 """
-cimport sddapi_c
-cimport compiler_c
+from . cimport sddapi_c
+from . cimport compiler_c
 
 cdef extern from "fnf.h":
     void free_fnf(compiler_c.Fnf* fnf)

pysdd/io_c.pxd

@@ -7,8 +7,8 @@ pysdd.io_c
 :copyright: Copyright 2017-2018 KU Leuven and Regents of the University of California.
 :license: Apache License, Version 2.0, see LICENSE for details.
 """
-cimport sddapi_c
-cimport compiler_c
+from . cimport sddapi_c
+from . cimport compiler_c
 
 cdef extern from "io.h":
     compiler_c.Fnf* read_fnf(const char* filename);

pysdd/sdd.pyx

@@ -11,11 +11,11 @@ SDD Python interface.
 
 """
 cimport cython
-cimport sddapi_c
-cimport compiler_c
-cimport io_c
-cimport fnf_c
-cimport weight_optimization_c
+from . cimport sddapi_c
+from . cimport compiler_c
+from . cimport io_c
+from . cimport fnf_c
+from . cimport weight_optimization_c
 from cpython cimport array
 from cpython.mem cimport PyMem_Malloc, PyMem_Free
 
@@ -1665,7 +1665,7 @@ cdef class WmcManager:
         """
         if len(weights) > 2 * self.node._manager.var_count():
             raise Exception("Array of weights is longer than the number of variables in the manager.")
-        cdef long nb_lits = len(weights) / 2  # The array can be shorter than the number of variables
+        cdef long nb_lits = len(weights) // 2  # The array can be shorter than the number of variables
         cdef sddapi_c.SddLiteral lit
         cdef long i
         for i in range(nb_lits):

pysdd/weight_optimization_c.pxd

@@ -7,12 +7,12 @@ pysdd.weight_optimization_c
 :copyright: Copyright 2017-2018 KU Leuven and Regents of the University of California.
 :license: Apache License, Version 2.0, see LICENSE for details.
 """
-cimport sddapi_c
+from . cimport sddapi_c
 
 cdef extern from "weight_optimizer.h":
 
     void optimize_weights(sddapi_c.SddNode* sdd, sddapi_c.SddManager* mgr, int m_instances,
                           int n_optimize, int* ind_optimize, double* weights_optimize, int* counts_optimize,
                           int n_fix, int* ind_fix, double* weights_fix,
                           long double prior_sigma, long double l1_const, int max_iter, long double delta,
-                          long double epsilon)
+                          long double epsilon)

setup.py

@@ -209,10 +209,10 @@ def build_extensions(self):
     raise ImportError('Cython not available')
 
 # install_requires = ['numpy', 'cython']
-install_requires = ['cython>=0.29.6']
+install_requires = ['cython>=3.0.0']
 setup_requires = ['setuptools>=18.0', 'cython>=0.29.6']
 tests_require = ['pytest']
-dev_require = tests_require + ['cython>=0.29.6']
+dev_require = tests_require + ['cython>=3.0.0']
 
 with (here / 'README.rst').open('r', encoding='utf-8') as f:
     long_description = f.read()