[jira] [Commented] (ARROW-1763) [Python] DataType should be hashable

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-1763?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16248746#comment-16248746 ] 

ASF GitHub Bot commented on ARROW-1763:
---------------------------------------

wesm opened a new pull request #1308: ARROW-1763: [Python] Implement __hash__ for DataType
URL: https://github.com/apache/arrow/pull/1308
 
 
   

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> [Python] DataType should be hashable
> ------------------------------------
>
>                 Key: ARROW-1763
>                 URL: https://issues.apache.org/jira/browse/ARROW-1763
>             Project: Apache Arrow
>          Issue Type: Improvement
>            Reporter: Jeff Reback
>            Assignee: Wes McKinney
>              Labels: pull-request-available
>             Fix For: 0.8.0
>
>
> We can then use the DataType objects as keys in dictionary for example. xref https://github.com/ibis-project/ibis/pull/1194#discussion_r148493472
> {code}
> In [1]: import pyarrow as pa
> In [2]: pa.__version__
> Out[2]: '0.7.1'
> In [3]: pa.int8()
> Out[3]: DataType(int8)
> In [4]: hash(pa.int8())
> ---------------------------------------------------------------------------
> TypeError                                 Traceback (most recent call last)
> <ipython-input-4-bca0e6e2f6af> in <module>()
> ----> 1 hash(pa.int8())
> TypeError: unhashable type: 'pyarrow.lib.DataType'
> {code}



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