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https://issues.apache.org/jira/browse/ARROW-2816?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16539670#comment-16539670
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Antoine Pitrou commented on ARROW-2816:
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Dimitri, hmm, you are right. It could be possible to solve that by using
composition: have a {{cdef}} class that contains the actual file handle, and
then a regular class inheriting from {{RawIOBase}} that delegates to methods of
the {{cdef}} class.
Otherwise we can just implement {{__iter__}} and {{__next__}}.
> [Python] Add __iter__ method to NativeFile
> ------------------------------------------
>
> Key: ARROW-2816
> URL: https://issues.apache.org/jira/browse/ARROW-2816
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Python
> Reporter: Wes McKinney
> Priority: Major
> Fix For: 0.10.0
>
>
> Copied from https://github.com/apache/arrow/issues/2114
> {code}
> Currently, NativeFile does not pass the check of pandas for being a
> "file-like" object because it does not have __iter__ method. It can be easily
> added using code from native python io module as a reference. Another way
> would be to subclass io.IOBase.
> The exact code of pandas check can be found here.
> Code for __iter__ method and io.IOBase can be found here.
> {code}
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