Regression in offsets caused offsets to be no longer hashable

doc/source/whatsnew/v1.1.4.rst

@@ -22,7 +22,7 @@ Fixed regressions
 - Fixed regression in :class:`RollingGroupby` causing a segmentation fault with Index of dtype object (:issue:`36727`)
 - Fixed regression in :meth:`DataFrame.resample(...).apply(...)` raised ``AttributeError`` when input was a :class:`DataFrame` and only a :class:`Series` was evaluated (:issue:`36951`)
 - Fixed regression in :class:`PeriodDtype` comparing both equal and unequal to its string representation (:issue:`37265`)
-- Fixed regression in :meth:`pd.offsets.Day() <pandas.tseries.offsets.Day>` and associated functions caused that offsets were no longer hashable (:issue:`37267`)
+- Fixed regression in certain offsets (:meth:`pd.offsets.Day() <pandas.tseries.offsets.Day>` and below) no longer being hashable (:issue:`37267`)
 
 .. ---------------------------------------------------------------------------
 

pandas/_libs/tslibs/offsets.pyx

@@ -752,9 +752,6 @@ cdef class Tick(SingleConstructorOffset):
                 "Tick offset with `normalize=True` are not allowed."
             )
 
-    def __hash__(self) -> int:
-        return hash(self._params)
-
     # FIXME: Without making this cpdef, we get AttributeError when calling
     #  from __mul__
     cpdef Tick _next_higher_resolution(Tick self):
@@ -794,6 +791,10 @@ cdef class Tick(SingleConstructorOffset):
     def is_anchored(self) -> bool:
         return False
 
+    # This is identical to DateOffset.__hash__, but has to be redefined here
+    # for Python 3, because we've redefined __eq__.
+    def __hash__(self) -> int:
+        return hash(self._params)
     # --------------------------------------------------------------------
     # Comparison and Arithmetic Methods
 

pandas/tests/tseries/offsets/test_offsets.py

@@ -680,7 +680,8 @@ def test_isAnchored_deprecated(self, offset_types):
 
     def test_offsets_hashable(self, offset_types):
         # GH: 37267
-        assert hash(offset_types) is not None
+        off = self._get_offset(offset_types)
+        assert hash(off) is not None
 
 
 class TestDateOffset(Base):