Hello again,
I'm working on a Python/Cython project with a large number of modules,
several of which I have Cythonized. I have collected all of the modules into
a single package. Attempting to compile these modules has revealed a couple
of potential issues, which I will outline below for a small test case.
First, the directory layout for the test case, which contains two modules
"foo" and "bar" in a package "bug":
/bug/__init__.py
/bug/bar.pxd
/bug/bar.py
/bug/foo.pxd
/bug/foo.py
/setup.py
/test.py
Next, the contents of the files:
# /bug/foo.py:
class Foo:
def hello(self):
print 'Hello from foo.Foo.hello()'
# /bug/foo.pxd:
cdef class Foo:
cpdef hello(self)
# /bug/bar.pxd:
from foo cimport Foo
cdef class Bar:
cdef public Foo foo
cpdef hello(self)
# /bug/bar.py:
import cython
from foo import Foo
class Bar:
def hello(self):
cython.declare(f=Foo)
f = Foo()
print 'Hello from bar.Bar.hello()'
# setup.py
from distutils.core import setup
from distutils.extension import Extension
from Cython.Distutils import build_ext
setup(
cmdclass={'build_ext': build_ext},
ext_modules=[Extension('bug.foo', ['bug/foo.py']), Extension('bug.bar',
['bug/bar.py'])]
)
# test.py
from bug.foo import Foo
from bug.bar import Bar
f = Foo()
f.hello() # Should print 'Hello from Foo.hello()'
b = Bar()
b.hello() # Should print 'Hello from Bar.hello()'
If I try to compile as is -- by running "python setup.py build_ext
--inplace" from the top-level directory --, Cython fails at the line "from
foo import Foo" in bar.py with the error "Assignment to non-lvalue 'Foo'".
If I remove this line, then everything compiles and runs properly. However,
I need this line to exist in order to run the file in pure Python mode.
I also tried moving the setup.py file within the bug package, adjusting its
content accordingly, and running from within the bug folder. (This is
probably not a good location for the setup.py file, but I was trying to see
if anything would work.) This also causes Cython to fail, but this time at
the line "cython.declare(f=Foo)" in bar.py with the error "Unknown type".
However, running cython from the console on bar.py while within the bug
directory does produce a valid C file.
Both of these cases are for Python 2.6.5 and Cython 0.12.1 on Ubuntu 10.04.
I also attempted to try it for the Cython 0.13 beta, but the problem seems
to persist. (Incidentally, is running "cython -V" with the 0.13 beta
supposed to print "Cython version 0.12.1"?)
Let me know if there's any other info you need.
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