pip install error for python 3.7

[Feng-long]

Hi
When I tried to install bandmat using pip install bandmat. There are errors like followings. I've already installed numpy scipy and cython(0.29). Python version is 3.7

bandmat/core.c: In function '__Pyx_ExceptionSave':
bandmat/core.c:15606:19: error: 'PyThreadState' has no member named 'exc_type'
*type = tstate->exc_type;
^
bandmat/core.c:15607:20: error: 'PyThreadState' has no member named 'exc_value'
*value = tstate->exc_value;
^
bandmat/core.c:15608:17: error: 'PyThreadState' has no member named 'exc_traceback'
*tb = tstate->exc_traceback;
^
bandmat/core.c: In function '__Pyx_ExceptionReset':
bandmat/core.c:15620:22: error: 'PyThreadState' has no member named 'exc_type'
tmp_type = tstate->exc_type;
^
bandmat/core.c:15621:23: error: 'PyThreadState' has no member named 'exc_value'
tmp_value = tstate->exc_value;
^
bandmat/core.c:15622:20: error: 'PyThreadState' has no member named 'exc_traceback'
tmp_tb = tstate->exc_traceback;
^
bandmat/core.c:15623:11: error: 'PyThreadState' has no member named 'exc_type'
tstate->exc_type = type;
^
bandmat/core.c:15624:11: error: 'PyThreadState' has no member named 'exc_value'
tstate->exc_value = value;
^
bandmat/core.c:15625:11: error: 'PyThreadState' has no member named 'exc_traceback'
tstate->exc_traceback = tb;
^
bandmat/core.c: In function '__Pyx_GetException':
bandmat/core.c:15668:22: error: 'PyThreadState' has no member named 'exc_type'
tmp_type = tstate->exc_type;
^
bandmat/core.c:15669:23: error: 'PyThreadState' has no member named 'exc_value'
tmp_value = tstate->exc_value;
^
bandmat/core.c:15670:20: error: 'PyThreadState' has no member named 'exc_traceback'
tmp_tb = tstate->exc_traceback;
^
bandmat/core.c:15671:11: error: 'PyThreadState' has no member named 'exc_type'
tstate->exc_type = local_type;
^
bandmat/core.c:15672:11: error: 'PyThreadState' has no member named 'exc_value'
tstate->exc_value = local_value;
^
bandmat/core.c:15673:11: error: 'PyThreadState' has no member named 'exc_traceback'
tstate->exc_traceback = local_tb;
^
error: command 'gcc' failed with exit status 1

[MattShannon]

Glad you closed the issue, Feng-long. What the key to resolving it, just out of interest?

[Feng-long]

When I changed to python 3.6, this problem is gone. Maybe the newest cython version doesn't match python 3.7. @MattShannon

[gogobd]

Got the same issue on conda python3.7 on debian.

[GabrieleMazzola]

I confirm that moving to Python 3.6 solves the issue.

[r9y9]

@MattShannon Hi, I am seeing the issue on python 3.7 and realized that this is caused by an internal change of cpython, which has been introduced in python 3.7. See cython/cython#1955 for discussion.

Updating pypi-sdist compilied with a newer version of cython (>= 0.28, that includes cython/cython@8ad16fc) will fix the issue. Could you confirm the issue and update the pypi source distribution? Otherwise we'll see installation failure via pip.

@Feng-long I think this issue should be reopend as it's not essentially fixed yet. Using python 3.6 can avoid the complication error though.

Ref: cython/cython#1955, cython/cython#1956, biolab/orange3#3067

[r9y9]

#11 is about the exact same issue.

[Feng-long]

@r9y9 Hi, I have reopened the issue for the further update :)

[Tanxj]

I got the same problem on python 3.7, waiting for fix it

[r9y9]

The problem is that the cython generated code in the release tar ball is not compatible with python 3.7. FYI, you can build bandmat from source with a newer cython if you want to use python 3.7.

[r9y9]

@MattShannon Could you take a look?