Use native namespace package

README.md

@@ -57,22 +57,3 @@ To use this solver (backend) with [`MixedIntegerLinearProgram`](http://doc.sagem
     sage: M.get_backend()
     <sage_numerical_backends_coin.coin_backend.CoinBackend object at 0x7fb72c2c7868>
 
-Setting it as the default backend for `MixedIntegerLinearProgram`, as of SageMath 9.0.beta10, requires some trickery:
-
-    sage: import sage_numerical_backends_coin.coin_backend as coin_backend, sage.numerical.backends as backends, sys
-    sage: sys.modules['sage.numerical.backends.coin_backend'] = backends.coin_backend = coin_backend
-    sage: default_mip_solver('Coin')
-
-To patch this in permanently (at your own risk):
-
-    $ sage -c 'import os; import sage.numerical.backends as dm; import sage_numerical_backends_coin.coin_backend as sm; s = sm.__file__; f = os.path.basename(s); d = os.path.join(dm.__path__[0], f); (os.path.exists(d) or os.path.lexists(d)) and os.remove(d); os.symlink(s, d);'
-
-Or use the script [`patch_into_sage_module.py`](patch_into_sage_module.py) in the source distribution that does the same:
-
-    $ sage -c 'load("patch_into_sage_module.py")'
-    Success: Patched in the module as sage.numerical.backends.coin_backend
-
-Verify with [`check_get_solver_with_name.py`](check_get_solver_with_name.py) that the patching script has worked:
-
-    $ sage -c 'load("check_get_solver_with_name.py")'
-    Success: get_solver(solver='coin') gives <sage_numerical_backends_coin.coin_backend.CoinBackend object at 0x7f8f20218528>

check_get_solver_with_name.py

@@ -1,7 +1,7 @@
 from __future__ import print_function
 # Check that the backend can be obtained by passing solver='coin' to get_solver.
 from sage.numerical.backends.generic_backend import get_solver
-from sage_numerical_backends_coin.coin_backend import CoinBackend
+from sage.numerical.backends.coin_backend import CoinBackend
 b = get_solver(solver='coin')
 assert type(b) == CoinBackend, "get_solver(solver='coin') does not give an instance of sage_numerical_backends_coin.coin_backend.CoinBackend"
 print("Success: get_solver(solver='coin') gives {}".format(b))

setup.py

@@ -44,8 +44,8 @@ def readfile(filename):
 cbc_include_dirs = cbc_pc['include_dirs']
 
 
-ext_modules = [Extension('sage_numerical_backends_coin.coin_backend',
-                         sources=[os.path.join('sage_numerical_backends_coin',
+ext_modules = [Extension('sage.numerical.backends.coin_backend',
+                         sources=[os.path.join('sage/numerical/backends',
                                     'coin_backend.pyx')],
                          libraries=cbc_libs,
                          include_dirs=sage_include_directories() + cbc_include_dirs,
@@ -81,7 +81,7 @@ def readfile(filename):
 print("Using compile_time_env: {}".format(compile_time_env), file=sys.stderr)
 
 setup(
-    name="sage_numerical_backends_coin",
+    name="sage.numerical.backends.coin_backend",
     version=readfile("VERSION").strip(),
     description="COIN-OR backend for Sage MixedIntegerLinearProgram",
     long_description = readfile("README.md"), # get the long description from the README
@@ -109,9 +109,8 @@ def readfile(filename):
                             compile_time_env=compile_time_env),
     cmdclass = {'test': SageTest}, # adding a special setup command for tests
     keywords=['milp', 'linear-programming', 'optimization'],
-    packages=['sage_numerical_backends_coin'],
-    package_dir={'sage_numerical_backends_coin': 'sage_numerical_backends_coin'},
-    package_data={'sage_numerical_backends_coin': ['*.pxd']},
+    packages=['sage.numerical.backends'],
+    package_data={'sage.numerical.backends': ['*.pxd']},
     install_requires = [# 'sage>=8',    ### On too many distributions, sage is actually not known as a pip package
                         'sphinx'],
     setup_requires   = ['pkgconfig'],