Python: Account for changes in PARQUET-834

[asfimport]

Reporter: Uwe Korn / @xhochy
Assignee: Uwe Korn / @xhochy

Related issues:

• Arrow release 0.2 (blocks)

_{Note: This issue was originally created as ARROW-523. Please see the migration documentation for further details.}

[asfimport]

Uwe Korn / @xhochy:
PR: #313

[asfimport]

Wes McKinney / @wesm:
Issue resolved by pull request 313
#313