Be compatible with numpy 1.18

Fix NaT sort order
Don't assume isinf/isnan fail on datetimes

Origin: upstream f85502531806df4f3c0233edffe9460f3ee26031 + 0c0adfbc291fc1b1e9afad592f5275e783ffd0b0
Author: jbrockmendel, Rebecca N. Palmer <[email protected]>
Bug-Debian: https://bugs.debian.org/958531


Gbp-Pq: Name numpy118_compat.patch

Author: Debian Science Team

pandas/__init__.py

@@ -24,6 +24,7 @@
     _np_version_under1p15,
     _np_version_under1p16,
     _np_version_under1p17,
+    _np_version_under1p18,
 )
 
 try:

pandas/core/indexes/datetimelike.py

@@ -262,7 +262,10 @@ def sort_values(self, return_indexer=False, ascending=True):
             sorted_index = self.take(_as)
             return sorted_index, _as
         else:
-            sorted_values = np.sort(self._ndarray_values)
+            # NB: using asi8 instead of _ndarray_values matters in numpy 1.18
+            #  because the treatment of NaT has been changed to put NaT last
+            #  instead of first.
+            sorted_values = np.sort(self.asi8)
             attribs = self._get_attributes_dict()
             freq = attribs["freq"]
 

pandas/tests/api/test_api.py

@@ -187,6 +187,7 @@ class TestPDApi(Base):
         "_np_version_under1p15",
         "_np_version_under1p16",
         "_np_version_under1p17",
+        "_np_version_under1p18",
         "_tslib",
         "_typing",
 # not in Debian        "_version",

pandas/tests/indexes/test_numpy_compat.py

@@ -6,9 +6,11 @@
     Float64Index,
     Index,
     Int64Index,
+    PeriodIndex,
     TimedeltaIndex,
     UInt64Index,
     _np_version_under1p17,
+    _np_version_under1p18,
 )
 from pandas.core.indexes.datetimelike import DatetimeIndexOpsMixin
 from pandas.util import testing as tm
@@ -80,18 +82,22 @@ def test_numpy_ufuncs_other(indices, func):
     idx = indices
     if isinstance(idx, (DatetimeIndex, TimedeltaIndex)):
 
-        # ok under numpy >= 1.17
-        if not _np_version_under1p17 and func in [np.isfinite]:
+        if not _np_version_under1p18 and func in [np.isfinite, np.isinf, np.isnan]:
+            # numpy 1.18(dev) changed isinf and isnan to not raise on dt64/tfd64
+            result = func(idx)
+            assert isinstance(result, np.ndarray)
+
+        elif not _np_version_under1p17 and func in [np.isfinite]:
+            # ok under numpy >= 1.17
             # Results in bool array
             result = func(idx)
             assert isinstance(result, np.ndarray)
-            assert not isinstance(result, Index)
         else:
             # raise TypeError or ValueError (PeriodIndex)
             with pytest.raises(Exception):
                 func(idx)
 
-    elif isinstance(idx, DatetimeIndexOpsMixin):
+    elif isinstance(idx, PeriodIndex):
         # raise TypeError or ValueError (PeriodIndex)
         with pytest.raises(Exception):
             func(idx)