[jira] [Created] (BEAM-2964) 2.1.0 with latest six (1.11.0) produces "metaclass conflict: the metaclass of a derived class must be a (non-strict) subclass of the metaclasses of all its bases"

["Steven Normore (JIRA)" <ji...@apache.org>]

Steven Normore created BEAM-2964:
------------------------------------

             Summary: 2.1.0 with latest six (1.11.0) produces "metaclass conflict: the metaclass of a derived class must be a (non-strict) subclass of the metaclasses of all its bases"
                 Key: BEAM-2964
                 URL: https://issues.apache.org/jira/browse/BEAM-2964
             Project: Beam
          Issue Type: Bug
          Components: sdk-py
    Affects Versions: 2.1.0
         Environment: Python 2.7 in a virtualenv on MacOS
            Reporter: Steven Normore
            Assignee: Ahmet Altay


{{$ virtualenv venv
[...]
$ source venv/bin/activate
[...]
$ pip install apache-beam[gcp]==2.1.0 six==1.11.0
[...]
$ python -c 'import apache_beam'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/Users/snormore/Workspace/beam-six/venv/lib/python2.7/site-packages/apache_beam/__init__.py", line 78, in <module>
    from apache_beam import io
  File "/Users/snormore/Workspace/beam-six/venv/lib/python2.7/site-packages/apache_beam/io/__init__.py", line 21, in <module>
    from apache_beam.io.avroio import *
  File "/Users/snormore/Workspace/beam-six/venv/lib/python2.7/site-packages/apache_beam/io/avroio.py", line 29, in <module>
    from apache_beam.io import filebasedsource
  File "/Users/snormore/Workspace/beam-six/venv/lib/python2.7/site-packages/apache_beam/io/filebasedsource.py", line 33, in <module>
    from apache_beam.io.filesystems import FileSystems
  File "/Users/snormore/Workspace/beam-six/venv/lib/python2.7/site-packages/apache_beam/io/filesystems.py", line 31, in <module>
    from apache_beam.io.gcp.gcsfilesystem import GCSFileSystem
  File "/Users/snormore/Workspace/beam-six/venv/lib/python2.7/site-packages/apache_beam/io/gcp/gcsfilesystem.py", line 27, in <module>
    from apache_beam.io.gcp import gcsio
  File "/Users/snormore/Workspace/beam-six/venv/lib/python2.7/site-packages/apache_beam/io/gcp/gcsio.py", line 36, in <module>
    from apache_beam.utils import retry
  File "/Users/snormore/Workspace/beam-six/venv/lib/python2.7/site-packages/apache_beam/utils/retry.py", line 38, in <module>
    from apitools.base.py.exceptions import HttpError
  File "/Users/snormore/Workspace/beam-six/venv/lib/python2.7/site-packages/apitools/base/py/__init__.py", line 21, in <module>
    from apitools.base.py.base_api import *
  File "/Users/snormore/Workspace/beam-six/venv/lib/python2.7/site-packages/apitools/base/py/base_api.py", line 31, in <module>
    from apitools.base.protorpclite import message_types
  File "/Users/snormore/Workspace/beam-six/venv/lib/python2.7/site-packages/apitools/base/protorpclite/message_types.py", line 25, in <module>
    from apitools.base.protorpclite import messages
  File "/Users/snormore/Workspace/beam-six/venv/lib/python2.7/site-packages/apitools/base/protorpclite/messages.py", line 1165, in <module>
    class Field(six.with_metaclass(_FieldMeta, object)):
TypeError: Error when calling the metaclass bases
    metaclass conflict: the metaclass of a derived class must be a (non-strict) subclass of the metaclasses of all its bases
(venv)
$ pip install six==1.10.0
[...]
$ python -c 'import apache_beam'
[success]
}}



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