TST: the pandas test suite fails on 32bit systems

I’ve been trying tonight to get the test suite to pass and keep getting some failures:

Results (25.73s):
     830 passed
       6 failed
         - pandas\tests\indexes/test_base.py:1370 TestIndex.test_get_indexer_with_NA_values[None-nan]
         - pandas\tests\indexes/test_base.py:1370 TestIndex.test_get_indexer_with_NA_values[None-unique_nulls_fixture22]
         - pandas\tests\indexes/test_base.py:1370 TestIndex.test_get_indexer_with_NA_values[nan-None]
         - pandas\tests\indexes/test_base.py:1370 TestIndex.test_get_indexer_with_NA_values[nan-unique_nulls_fixture22]
         - pandas\tests\indexes/test_base.py:1370 TestIndex.test_get_indexer_with_NA_values[unique_nulls_fixture2-None]
         - pandas\tests\indexes/test_base.py:1370 TestIndex.test_get_indexer_with_NA_values[unique_nulls_fixture2-nan]
       2 xfailed
      63 skipped

The issue is related to integer dtypes:

E       AssertionError: numpy array are different
E
E       Attribute "dtype" are different
E       [left]:  int32
E       [right]: int64

Can anyone confirm if this is a failure on pandas on windows?

[topper-123]

I’ve looked more into this and have found the culprit to be #22296.

https://github.com/pandas-dev/pandas/blob/f4fae353eaaa719db335ec2b21259932de30f46d/pandas/tests/indexes/test_base.py#L1382

I.e. in line 1382 in test_base.py, the dtype should be np.intp rather than np.int64.

Do people agree?

Returning platform dtype is the current behaviour for Index.get_indexer, e.g. (on pandas 0.23.1 on 32bit python on Windows 10):

In [1]: index = pd.Index(['a', 'b'], dtype=np.object)
In [2]: index.get_indexer(['a', 'b', 'c'])
Out[2]: array([ 0,  1, -1], dtype=int32)

[mroeschke]

The period error you found @h-vetinari was noted here: https://github.com/pandas-dev/pandas/issues/22905