CLN: remove unused kwarg from IntervalIndex._searchsorted_monotonic (#40578)

Author: jbrockmendel

pandas/core/indexes/base.py

@@ -5678,7 +5678,7 @@ def _maybe_cast_slice_bound(self, label, side: str_t, kind):
 
         return label
 
-    def _searchsorted_monotonic(self, label, side="left"):
+    def _searchsorted_monotonic(self, label, side: str_t = "left"):
         if self.is_monotonic_increasing:
             return self.searchsorted(label, side=side)
         elif self.is_monotonic_decreasing:

pandas/core/indexes/interval.py

@@ -598,7 +598,7 @@ def _maybe_convert_i8(self, key):
 
         return key_i8
 
-    def _searchsorted_monotonic(self, label, side, exclude_label=False):
+    def _searchsorted_monotonic(self, label, side: str = "left"):
         if not self.is_non_overlapping_monotonic:
             raise KeyError(
                 "can only get slices from an IntervalIndex if bounds are "
@@ -615,11 +615,11 @@ def _searchsorted_monotonic(self, label, side, exclude_label=False):
             side == "right" and not self.left.is_monotonic_increasing
         ):
             sub_idx = self.right
-            if self.open_right or exclude_label:
+            if self.open_right:
                 label = _get_next_label(label)
         else:
             sub_idx = self.left
-            if self.open_left or exclude_label:
+            if self.open_left:
                 label = _get_prev_label(label)
 
         return sub_idx._searchsorted_monotonic(label, side)