[Python-modules-team] Bug#751460: Bug#751460: ecdsa/util.py throws ImportException, cannot find "next" in python-six

[Sebastian Ramacher]

Control: tags -1 + moreinfo

On 2014-06-13 09:17:02, Michael Stapelberg wrote:
> Source: python-ecdsa
> Version: 0.11-1
> Severity: important
> 
> I use duplicity, which uses python-paramiko, which uses python-ecdsa
> since version 1.14.0-1.
> 
> After upgrading to testing yesterday, duplicity does not work any
> longer. This is the exception I get:
> 
> $ /usr/bin/duplicity list-current-files "$BASEPATH/root"                                                    
> Traceback (most recent call last):
>   File "/usr/bin/duplicity", line 1495, in <module>
>     with_tempdir(main)
>   File "/usr/bin/duplicity", line 1489, in with_tempdir
>     fn()
>   File "/usr/bin/duplicity", line 1323, in main
>     action = commandline.ProcessCommandLine(sys.argv[1:])
>   File "/usr/lib/python2.7/dist-packages/duplicity/commandline.py", line 1027, in ProcessCommandLine
>     globals.backend = backend.get_backend(args[0])
>   File "/usr/lib/python2.7/dist-packages/duplicity/backend.py", line 161, in get_backend
>     return _backends[pu.scheme](pu)
>   File "/usr/lib/python2.7/dist-packages/duplicity/backends/_ssh_paramiko.py", line 75, in __init__
>     import paramiko
>   File "/usr/lib/python2.7/dist-packages/paramiko/__init__.py", line 31, in <module>
>     from paramiko.transport import SecurityOptions, Transport
>   File "/usr/lib/python2.7/dist-packages/paramiko/transport.py", line 55, in <module>
>     from paramiko.ecdsakey import ECDSAKey
>   File "/usr/lib/python2.7/dist-packages/paramiko/ecdsakey.py", line 26, in <module>
>     from ecdsa import SigningKey, VerifyingKey, der, curves
>   File "/usr/lib/python2.7/dist-packages/ecdsa/__init__.py", line 3, in <module>
>     from .keys import SigningKey, VerifyingKey, BadSignatureError, BadDigestError
>   File "/usr/lib/python2.7/dist-packages/ecdsa/keys.py", line 5, in <module>
>     from . import rfc6979
>   File "/usr/lib/python2.7/dist-packages/ecdsa/rfc6979.py", line 14, in <module>
>     from .util import number_to_string, number_to_string_crop
>   File "/usr/lib/python2.7/dist-packages/ecdsa/util.py", line 9, in <module>
>     from six import PY3, int2byte, b, next
> ImportError: cannot import name next
> 
> There have not been recent changes in python-six, so I’m not sure how
> python-ecdsa can ever have worked properly :).
> 
> Downgrading to python-paramiko 1.10.1-1 fixes the issue, as that version
> is not using python-ecdsa at all.
> 
> Can you please take a look?

$ python -c "from six import PY3, int2byte, b, next"
$ python -c "import paramiko"

in both unstable and jessie. So, please tell me more about your version
of python-six. Do you have an old copy if six somewhere in your
PYTHONPATH?

Cheers
-- 
Sebastian Ramacher
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