Omer Katz created ARROW-2464:

             Summary: [Python] Use a python_version marker instead of a 
                 Key: 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 

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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