Stefan Behnel added the comment:
Interesting. I didn't know that. The .py file is always installed automatically
next to the .so file by distutils.
Here's what strace gives me:
Python 2.7:
stat("my_test_package", {st_mode=S_IFDIR|0775, st_size=4096, ...}) = 0
stat("my_test_package/__init__.py", {st_mode=S_IFREG|0664, st_size=557, ...}) = 0
stat("my_test_package/__init__", 0x7fffdc9dd320) = -1 ENOENT (No such file or
directory)
open("my_test_package/__init__.so", O_RDONLY) = 3
open("my_test_package/__init__.so", O_RDONLY|O_CLOEXEC) = 4
Python 3.2:
stat("my_test_package", {st_mode=S_IFDIR|0775, st_size=4096, ...}) = 0
stat("my_test_package/__init__.py", {st_mode=S_IFREG|0664, st_size=557, ...}) = 0
stat("my_test_package/__init__", 0x7fff9d99d700) = -1 ENOENT (No such file or
directory)
stat("my_test_package/__init__.cpython-32mu.so", {st_mode=S_IFREG|0775,
st_size=82517, ...}) = 0
open("my_test_package/__init__.cpython-32mu.so", O_RDONLY) = 3
open("my_test_package/__init__.cpython-32mu.so", O_RDONLY|O_CLOEXEC) = 4
Python 3.3:
stat("./my_test_package", {st_mode=S_IFDIR|0775, st_size=4096, ...}) = 0
stat("./my_test_package/__init__.cpython-33dm.so", {st_mode=S_IFREG|0775,
st_size=36119, ...}) = 0
open("./my_test_package/__init__.cpython-33dm.so", O_RDONLY|O_CLOEXEC) = 3
That's the difference then.
Ok, I think we'll have to emulate this for older CPython versions as well for
the case that the .py file is not there. So it's likely best to let Cython
register the package in sys.modules at init time, right after calling
AddModule().
Still - can this be implemented in CPython for 3.3? Or 3.4, given that it might
appear like a new feature? There shouldn't be all that much to change.
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<http://bugs.python.org/issue15623>
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