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[jira] [Created] (ARROW-3557) [Python] Set language_level in Cython sources

Antoine Pitrou created ARROW-3557:

             Summary: [Python] Set language_level in Cython sources
                 Key: ARROW-3557
                 URL: https://issues.apache.org/jira/browse/ARROW-3557
             Project: Apache Arrow
          Issue Type: Improvement
          Components: Python
    Affects Versions: 0.11.0
            Reporter: Antoine Pitrou

Cython 0.29.0 emits the following warning:
C:\Miniconda36-x64\envs\arrow\lib\site-packages\Cython\Compiler\Main.py:367: FutureWarning: Cython directive 'language_level' not set, using 2 for now (Py2). This will change in a later release! File: C:\projects\arrow\python\pyarrow\_parquet.pxd

We should probably try to switch it to Python 3.

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