"from opencog.atomspace import AtomSpace" not working with python3

[Eyob]

I am building opencog inside docker. After successful build, i ran  "from opencog.atomspace import AtomSpace"  on python3 and get this error


>>> from opencog.atomspace import AtomSpace
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: dynamic module does not define module export function (PyInit_atomspace)


what could be the cause of this error, "ImportError: dynamic module does not define module export function (PyInit_atomspace)"?

[Eyob]

Apparently it worked with python 3.5 inside ubuntu16.04. But I got this error with ubutnu 14.04 in python 3.4.

[Linas Vepstas]

Are you sure that you build the python3 and not the python2 bindings?

See, for, for example: build/opencog/cython/opencog/atomspace.cpp
around line 16267 or so (search for PyInit_atomspace).

You can also look at symbols: the nm command the num command dumps
the symbol table in an object, so for example:

nm opencog/cython/opencog//atomspace.so |less
nm opencog/cython/opencog//atomspace.so |grep PyInit

All C/C++ programmers should know the nm command, and be familiar with
what it does, and if you are working with cython, you should be
familiar with the files that cython generates (such as
build/opencog/cython/opencog/atomspace.cpp)

--linas

On Tue, Feb 27, 2018 at 10:56 AM, Eyob <edyi...@gmail.com> wrote:
> Apparently it worked with python 3.5 inside ubuntu16.04. But I got this
> error with ubutnu 14.04 in python 3.4.
>

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