Python3 / comedi?
Bernd Porr
Hi all, is anybody using python3 and comedi under Bionic Beaver? Python 3.6.6 (default, Sep 12 2018, 18:26:19) [GCC 8.0.1 20180414 (experimental) [trunk revision 259383]] on linux Type "help", "copyright", "credits" or "license" for more information.
import comedi as c dev=c.comedi_open('/dev/comedi0')
Traceback (most recent call last): File "<stdin>", line 1, in <module> AttributeError: module 'comedi' has no attribute 'comedi_open'
bp1@bp1-Precision-WorkStation-T5400:~/python$ python Python 2.7.15rc1 (default, Apr 15 2018, 21:51:34) [GCC 7.3.0] on linux2 Type "help", "copyright", "credits" or "license" for more information.
import comedi as c dev=c.comedi_open('/dev/comedi0')
You see it works under Python2 but not Python3. Is there another approach to it? /Bernd
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Bernd Porr
I've just tried Trevor's pycomedi. That's the output from pip below. Won't compile. I've also checked it out from his git. That installs but then the demo programs crash with internal errors. I guess it's hopelessly out of date? ;)
Was hoping to use Python3 and my USBDUX boxes for teaching but
seems to be virtually impossible?
/Bernd
/usr/local/lib/python3.6/dist-packages/Cython/Compiler/Main.py:367:
FutureWarning: Cython directive 'language_level' not set, using 2
for now (Py2). This will change in a later release! File:
/tmp/pip-build-07z_v5yg/pycomedi/pycomedi/command.pxd
tree = Parsing.p_module(s, pxd, full_module_name)
Error compiling Cython file:
------------------------------------------------------------
...
if self._cmd.chanlist is not NULL:
_stdlib.free(self._cmd.chanlist)
if self._cmd.data is not NULL:
_stdlib.free(self._cmd.data)
cdef _comedi_h.comedi_cmd *get_comedi_cmd_pointer(self)
except *:
^
------------------------------------------------------------
pycomedi/command.pyx:147:9: Signature not compatible with
previous declaration
Error compiling Cython file:
------------------------------------------------------------
...
cdef class Command (object):
cdef _comedi_h.comedi_cmd _cmd
cdef public list _fields
cdef _comedi_h.comedi_cmd *get_comedi_cmd_pointer(self)
^
------------------------------------------------------------
pycomedi/command.pxd:26:30: Previous declaration is here
building 'pycomedi.command' extension
x86_64-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -g
-fstack-protector-strong -Wformat -Werror=format-security
-Wdate-time -D_FORTIFY_SOURCE=2 -fPIC
-I/usr/lib/python3/dist-packages/numpy/core/include
-I/usr/include/python3.6m -c pycomedi/command.c -o
build/temp.linux-x86_64-3.6/pycomedi/command.o
pycomedi/command.c:1:2: error: #error Do not use this file, it
is the result of a failed Cython compilation.
#error Do not use this file, it is the result of a failed
Cython compilation.
^~~~~
error: command 'x86_64-linux-gnu-gcc' failed with exit status
1
----------------------------------------
Command "/usr/bin/python3 -u -c "import setuptools,
tokenize;__file__='/tmp/pip-build-07z_v5yg/pycomedi/setup.py';f=getattr(tokenize,
'open', open)(__file__);code=f.read().replace('\r\n',
'\n');f.close();exec(compile(code, __file__, 'exec'))" install
--record /tmp/pip-k0nrw6m9-record/install-record.txt
--single-version-externally-managed --compile" failed with error
code 1 in /tmp/pip-build-07z_v5yg/pycomedi/
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Ian Abbott
> Hi all,
>
> is anybody using python3 and comedi under Bionic Beaver?
>
> Python 3.6.6 (default, Sep 12 2018, 18:26:19)
> [GCC 8.0.1 20180414 (experimental) [trunk revision 259383]] on linux
> Type "help", "copyright", "credits" or "license" for more information.
>
>>>> import comedi as c
>>>> dev=c.comedi_open('/dev/comedi0')
>
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> AttributeError: module 'comedi' has no attribute 'comedi_open'
Python 3 incompatibilities. The changes are in comedilib 0.11.0, but if
you have the latest 0.10.x versions of the python-comedilib or
python3-comedilib packages installed, they won't work with
libcomedi.so.0.11.x.
You may need to set PYTHON_PATH in the runtime environment to point to
the directory containing locally installed 0.11.x versions of comedi.py
and _comedi.so. (There are no Debian or Ubuntu packages for comedilib
0.11.0 yet.)
>
> bp1@bp1-Precision-WorkStation-T5400:~/python$ python
>
> Python 2.7.15rc1 (default, Apr 15 2018, 21:51:34)
> [GCC 7.3.0] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>
>>>> import comedi as c
>>>> dev=c.comedi_open('/dev/comedi0')
>>>>
> You see it works under Python2 but not Python3. Is there another
> approach to it?
>
> /Bernd
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Bernd Porr
I'm using it in a large lab with 160 students and most of them would
struggle to fix it. I think we need to get the wrapper properly going at
some point.
Thanks,
/Bernd