Installed through dependencies "websocket" library doesn't work with Python 3

[rutsky]

During pip install docker-py with Python 3 I'm getting following error:

  Running setup.py install for websocket-client
    changing mode of build/scripts-3.3/wsdump.py from 644 to 755
      File "/home/bob/env/lib/python3.3/site-packages/websocket.py", line 769
        except Exception, e:
                        ^
    SyntaxError: invalid syntax

Looks like this error is ignored and actually docker finishes it's installation and works afterwards, but if docker-py uses websocket library it's usage will fail.

According to websocket docs they have separate branch for Python 3: https://github.com/liris/websocket-client/tree/py3

[mpetazzoni]

I'm not sure there is much we can do here. I don't think there is a way to specify different dependencies based on the Python version with pip/requirements.txt.

[rutsky]

I made proof-of-concept PR #178 for using different requirements lists in Python 2 and Pythin 3.

In setup.py we can select dependencies based on current sys.version_info and in tox.ini we can select requirements based on environment name (too bad tox doesn't allow to specify multiple environments in single "[testenv]", I made feature request for this: https://bitbucket.org/hpk42/tox/issue/159/support-multiple-environments)