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Dimitri Vorona edited comment on ARROW-2816 at 7/11/18 7:36 AM:
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Antoine, are you sure? I maybe missunderstand [the 
docs|http://cython.readthedocs.io/en/latest/src/userguide/extension_types.html#subclassing]
 but I think you can only inherit from other extension (i.e. Cython) classes or 
built-in types. At least I couldn't get it working. The other way around works 
fine, of course.


was (Author: alendit):
Antoine, are you sure? I maybe missunderstand [the 
docs|http://cython.readthedocs.io/en/latest/src/userguide/extension_types.html#subclassing]
 but I think you can only inherit from other extension (i.e. Cython) classes or 
built-in types. The other way around works fine, of course.

> [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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