Keith Kraus created ARROW-4324:
----------------------------------

             Summary: [Python] Array dtype inference incorrect when created 
from list of mixed numpy scalars
                 Key: ARROW-4324
                 URL: https://issues.apache.org/jira/browse/ARROW-4324
             Project: Apache Arrow
          Issue Type: Bug
    Affects Versions: 0.11.1
            Reporter: Keith Kraus


Minimal reproducer:
{code:python}
import pyarrow as pa
import numpy as np

test_list = [np.dtype('int32').type(10), np.dtype('float32').type(0.5)]
test_array = pa.array(test_list)

# Expected
# test_array
# <pyarrow.lib.DoubleArray object at 0x7f009963bf48>
# [
#   10,
#   0.5
# ]

# Got
# test_array
# <pyarrow.lib.Int32Array object at 0x7f009963bf48>
# [
#   10,
#   0
# ]
{code}




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