ASF GitHub Bot commented on ARROW-2240:

xhochy commented on issue #1686: ARROW-2240: [Python] Array initialization with 
leading numpy nan fails with exception
URL: https://github.com/apache/arrow/pull/1686#issuecomment-369933263

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> [Python] Array initialization with leading numpy nan fails with exception
> -------------------------------------------------------------------------
>                 Key: ARROW-2240
>                 URL: https://issues.apache.org/jira/browse/ARROW-2240
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: Python
>    Affects Versions: 0.8.0
>            Reporter: Florian Jetter
>            Priority: Minor
>              Labels: pull-request-available
> Arrow initialization fails for string arrays with leading numpy NAN
> {code:java}
> import pyarrow as pa
> import numpy as np
> pa.array([np.nan, 'str'])
> # Py3: ArrowException: Unknown error: must be real number, not str
> # Py2: ArrowException: Unknown error: a float is required{code}

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