导入apache_beam元类冲突 [英] import apache_beam metaclass conflict

问题描述

当我尝试导入apache beam时，出现以下错误.

>>> import apache_beam
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/toor/pfff/local/lib/python2.7/site-packages/apache_beam/__init__.py", line 78, in <module>
    from apache_beam import io
  File "/home/toor/pfff/local/lib/python2.7/site-packages/apache_beam/io/__init__.py", line 21, in <module>
    ...
    from apitools.base.protorpclite import messages
  File "/home/toor/pfff/local/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

我正在一个新的虚拟环境中工作，其中我通过安装pip安装google-cloud-dataflow来安装apache_beam，因为我需要能够在google云平台上运行的版本.

pip install google-cloud-dataflow

我不知道如何解决此错误.为了完整起见，我在Windows上的ubuntu上的bash上使用python 2.7.12.我的同事在Windows上的ubuntu上的bash上运行它时，也遇到了相同的错误，而直接在Windows上运行则很好.

软件包的安装版本为:

>>> pip freeze
apache-beam==2.1.0
avro==1.8.2
cachetools==2.0.1
certifi==2017.7.27.1
chardet==3.0.4
crcmod==1.7
dill==0.2.6
enum34==1.1.6
funcsigs==1.0.2
future==0.16.0
futures==3.1.1
gapic-google-cloud-pubsub-v1==0.15.4
google-apitools==0.5.11
google-auth==1.1.0
google-auth-httplib2==0.0.2
google-cloud-bigquery==0.25.0
google-cloud-core==0.25.0
google-cloud-dataflow==2.1.0
google-cloud-pubsub==0.26.0
google-gax==0.15.15
googleapis-common-protos==1.5.2
googledatastore==7.0.1
grpc-google-iam-v1==0.11.3
grpcio==1.6.0
httplib2==0.9.2
idna==2.6
mock==2.0.0
oauth2client==3.0.0
pbr==3.1.1
pkg-resources==0.0.0
ply==3.8
proto-google-cloud-datastore-v1==0.90.4
proto-google-cloud-pubsub-v1==0.15.4
protobuf==3.3.0
pyasn1==0.3.5
pyasn1-modules==0.1.4
PyYAML==3.12
requests==2.18.4
rsa==3.4.2
six==1.11.0
urllib3==1.22

解决方案

将六个版本降级为1.10.0

pip install six==1.10.0

When I try to import apache beam I get the following error.

>>> import apache_beam
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/toor/pfff/local/lib/python2.7/site-packages/apache_beam/__init__.py", line 78, in <module>
    from apache_beam import io
  File "/home/toor/pfff/local/lib/python2.7/site-packages/apache_beam/io/__init__.py", line 21, in <module>
    ...
    from apitools.base.protorpclite import messages
  File "/home/toor/pfff/local/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

I'm working in a new virtual environment in which I have installed apache_beam by installing google-cloud-dataflow with pip as I need the version that is able to run on google cloud platform.

pip install google-cloud-dataflow

I have no idea how to solve this error. For completeness, I'm using python 2.7.12 on bash on ubuntu on Windows. My colleague had the same error when running it on bash on ubuntu on Windows, while directly running on Windows is working fine.

The installed versions of the packages are:

>>> pip freeze
apache-beam==2.1.0
avro==1.8.2
cachetools==2.0.1
certifi==2017.7.27.1
chardet==3.0.4
crcmod==1.7
dill==0.2.6
enum34==1.1.6
funcsigs==1.0.2
future==0.16.0
futures==3.1.1
gapic-google-cloud-pubsub-v1==0.15.4
google-apitools==0.5.11
google-auth==1.1.0
google-auth-httplib2==0.0.2
google-cloud-bigquery==0.25.0
google-cloud-core==0.25.0
google-cloud-dataflow==2.1.0
google-cloud-pubsub==0.26.0
google-gax==0.15.15
googleapis-common-protos==1.5.2
googledatastore==7.0.1
grpc-google-iam-v1==0.11.3
grpcio==1.6.0
httplib2==0.9.2
idna==2.6
mock==2.0.0
oauth2client==3.0.0
pbr==3.1.1
pkg-resources==0.0.0
ply==3.8
proto-google-cloud-datastore-v1==0.90.4
proto-google-cloud-pubsub-v1==0.15.4
protobuf==3.3.0
pyasn1==0.3.5
pyasn1-modules==0.1.4
PyYAML==3.12
requests==2.18.4
rsa==3.4.2
six==1.11.0
urllib3==1.22

解决方案

Downgrade six to version 1.10.0

pip install six==1.10.0

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