Wes McKinney created ARROW-1222:
-----------------------------------

             Summary: [Python] pyarrow.array returns NullArray for array of 
unsupported Python objects
                 Key: ARROW-1222
                 URL: https://issues.apache.org/jira/browse/ARROW-1222
             Project: Apache Arrow
          Issue Type: Bug
          Components: Python
            Reporter: Wes McKinney


{code}
In [4]: arr = np.array([datetime.timedelta(1), datetime.timedelta(2)])

In [5]: pa.array(arr)
Out[5]: 
<pyarrow.lib.NullArray object at 0x7fbb612bba48>
[
  NA,
  NA
]
{code}



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