[Baypiggies] Python 3 and swig help for m2crypto?

[Craig Rodrigues]

Hi,

I did the following:
(1)  Read "PEP 0328 -- Imports: Multi-Line and Absolute/Relative"  (
https://www.python.org/dev/peps/pep-0328/ ) a few times.

(2)  Ran "2to3 -f import M2Crypto" to generate a list of places to which
needed fixing of the imports

(3)  Applied the patch from (2), and also added "from __future__ import
absolute_import" to all the files
       that I touched.  This brings in the PEP 328 behavior which is
default in Python 3, back to Python 2.

(4)  I tested out this patch:
https://gitlab.com/rodrigc/m2crypto/commit/4e5937ac
       Under Python 2.7, the tests passed.

However, I tested the code under Python 3, and got the attached error.
It turns out that the Python C API has changed between Python 2 and Python
3.
So, Python code which uses the C API (such as M2Crypto) needs to be ported.
(!!)
     https://docs.python.org/3/howto/cporting.html

--
Craig

On Mon, Nov 16, 2015 at 4:57 PM, Fahrzin Hemmati <fahhem at google.com> wrote:

> I'm not sure, but maybe converting that to a relative import “import
> ._m2crypto” or “from . import _m2crypto” might fix it, but only for python
> 3. Maybe running a specific incantation of 2to3 against the file in the
> build step?
>
>
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Script started on Tue Nov 17 21:09:51 2015
command: python setup.py test
/usr/home/rodrigc/astrenv/lib/python3.5/site-packages/setuptools/dist.py:285: UserWarning: Normalizing '0.22.6.rc3' to '0.22.6rc3'
  normalized_version,
running test
running egg_info
writing M2Crypto.egg-info/PKG-INFO
writing dependency_links to M2Crypto.egg-info/dependency_links.txt
writing top-level names to M2Crypto.egg-info/top_level.txt
reading manifest file 'M2Crypto.egg-info/SOURCES.txt'
reading manifest template 'MANIFEST.in'
writing manifest file 'M2Crypto.egg-info/SOURCES.txt'
running build_ext
copying build/lib.freebsd-10.2-PRERELEASE-amd64-3.5/M2Crypto/__m2crypto.so -> M2Crypto
copying build/lib.freebsd-10.2-PRERELEASE-amd64-3.5/M2Crypto/_m2crypto.py -> M2Crypto
Traceback (most recent call last):
  File "setup.py", line 153, in <module>
    cmdclass={'build_ext': _M2CryptoBuildExt}
  File "/usr/local/lib/python3.5/distutils/core.py", line 148, in setup
    dist.run_commands()
  File "/usr/local/lib/python3.5/distutils/dist.py", line 955, in run_commands
    self.run_command(cmd)
  File "/usr/local/lib/python3.5/distutils/dist.py", line 974, in run_command
    cmd_obj.run()
  File "/usr/home/rodrigc/astrenv/lib/python3.5/site-packages/setuptools/command/test.py", line 146, in run
    self.with_project_on_sys_path(self.run_tests)
  File "/usr/home/rodrigc/astrenv/lib/python3.5/site-packages/setuptools/command/test.py", line 127, in with_project_on_sys_path
    func()
  File "/usr/home/rodrigc/astrenv/lib/python3.5/site-packages/setuptools/command/test.py", line 167, in run_tests
    testRunner=self._resolve_as_ep(self.test_runner),
  File "/usr/local/lib/python3.5/unittest/main.py", line 93, in __init__
    self.parseArgs(argv)
  File "/usr/local/lib/python3.5/unittest/main.py", line 140, in parseArgs
    self.createTests()
  File "/usr/local/lib/python3.5/unittest/main.py", line 147, in createTests
    self.module)
  File "/usr/local/lib/python3.5/unittest/loader.py", line 219, in loadTestsFromNames
    suites = [self.loadTestsFromName(name, module) for name in names]
  File "/usr/local/lib/python3.5/unittest/loader.py", line 219, in <listcomp>
    suites = [self.loadTestsFromName(name, module) for name in names]
  File "/usr/local/lib/python3.5/unittest/loader.py", line 204, in loadTestsFromName
    test = obj()
  File "/usr/home/rodrigc/2/m2crypto/tests/alltests.py", line 6, in suite
    from M2Crypto import m2
  File "/usr/home/rodrigc/2/m2crypto/M2Crypto/__init__.py", line 24, in <module>
    from . import _m2crypto
  File "/usr/home/rodrigc/2/m2crypto/M2Crypto/_m2crypto.py", line 28, in <module>
    __m2crypto = swig_import_helper()
  File "/usr/home/rodrigc/2/m2crypto/M2Crypto/_m2crypto.py", line 24, in swig_import_helper
    _mod = imp.load_module('__m2crypto', fp, pathname, description)
  File "/usr/local/lib/python3.5/imp.py", line 242, in load_module
    return load_dynamic(name, filename, file)
  File "/usr/local/lib/python3.5/imp.py", line 342, in load_dynamic
    return _load(spec)
ImportError: /usr/home/rodrigc/2/m2crypto/M2Crypto/__m2crypto.so: Undefined symbol "PyFile_Check"

Script done on Tue Nov 17 21:09:52 2015