Omer Katz created ARROW-2464:
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             Summary: [Python] Use a python_version marker instead of a 
condition
                 Key: ARROW-2464
                 URL: https://issues.apache.org/jira/browse/ARROW-2464
             Project: Apache Arrow
          Issue Type: Task
          Components: Packaging, Python
    Affects Versions: 0.9.0
            Reporter: Omer Katz


When installing pyarrow 0.9.0 pipenv complains that futures has no matching 
versions.

While that may be a bug in pipenv it does not matter. The standard way to 
specify a conditional dependency is using a marker.

We should use the python_version marker to tell pip if it should install 
futures or not.



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