[jira] [Created] (ARROW-6248) [Python] Use FileNotFoundError in HadoopFileSystem.open() in Python 3

["Alexander Schepanovski (JIRA)" <ji...@apache.org>]

Alexander Schepanovski created ARROW-6248:
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             Summary: [Python] Use FileNotFoundError in HadoopFileSystem.open() in Python 3 
                 Key: ARROW-6248
                 URL: https://issues.apache.org/jira/browse/ARROW-6248
             Project: Apache Arrow
          Issue Type: Improvement
          Components: Python
    Affects Versions: 0.14.1
            Reporter: Alexander Schepanovski


When file is absent pyarrow throws 
{code:python}
ArrowIOError('HDFS file does not exist: ...')
{code}
which inherits from {{IOError}} and {{pyarrow.lib.ArrowException}}, it would be better if that was {{FileNotFoundError}} a subclass of {{IOError}} for this particular purpose. Also, {{.errno}} property is empty (should be 2) so one needs to match by error message to check for particular error.

*P.S.* There is no  {{FileNotFoundError}} in Python 2, but there is `.errno` property there.



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