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https://issues.apache.org/jira/browse/ARROW-2816?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16538862#comment-16538862
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Dimitri Vorona commented on ARROW-2816:
---------------------------------------
We can't subclass Python classes in extension types, can we? We could register
NativeFile with RawIOBase, though.
How would you prefer to solve this issue, just add __iter__ + __next__ to
NativeFile (should be trivial) or rather extend it to the whole RawIOBase
interface and register it, so that it passes other possible checks, too?
> [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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