Starting on RIIR, first steps have been whelming

1 files changed, 8 insertions, 16 deletions

diff --git a/python/src/types/selection.py b/python/src/types/selection.py
index 478b5b9..d75c9f0 100644
--- a/python/src/types/selection.py
+++ b/python/src/types/selection.py
@@ -38,15 +38,13 @@ class Selection:
 
     @classmethod
     def empty(cls) -> "Selection":
-        return cls(selection=Position(0), buffers=set())
+        return cls(selection=Ranges(ranges=[]), buffers=set())
 
     def promote(self, to_rank: int) -> "Selection":
         if to_rank < 0 or to_rank > 3:
             raise ValueError(f"Invalid rank: {to_rank}")
         if self.rank > to_rank:
-            raise ValueError(
-                f"Cannot coerce selection of rank {self.rank} to rank {to_rank}"
-            )
+            raise ValueError(f"Cannot coerce selection of rank {self.rank} to rank {to_rank}")
         if self.rank == to_rank:
             return self
         match self.selection:
@@ -61,22 +59,16 @@ class Selection:
                 if to_rank == 2:
                     return Selection(selection=as_ranges, buffers=self.buffers)
                 if to_rank == 3:
-                    return Selection(
-                        MultiRanges({buffer: as_ranges for buffer in self.buffers})
-                    )
+                    return Selection(MultiRanges({buffer: as_ranges for buffer in self.buffers}))
             case Range(_, _):
                 as_ranges = Ranges(ranges=[self.selection])
                 if to_rank == 2:
                     return Selection(selection=as_ranges, buffers=self.buffers)
                 if to_rank == 3:
-                    return Selection(
-                        MultiRanges({buffer: as_ranges for buffer in self.buffers})
-                    )
+                    return Selection(MultiRanges({buffer: as_ranges for buffer in self.buffers}))
             case Ranges(_):
-                return Selection(
-                    MultiRanges({buffer: self.selection for buffer in self.buffers})
-                )
-            
+                return Selection(MultiRanges({buffer: self.selection for buffer in self.buffers}))
+
         raise RuntimeError("Unexpected promotion issue")
 
     @classmethod
@@ -101,7 +93,7 @@ class Selection:
         if max_rank == 2:
             all_ranges = []
             for sel in promoted:
-                if not type(sel.selection) is Ranges:
+                if type(sel.selection) is not Ranges:
                     raise ValueError(
                         f"Selection of rank {sel.rank} is not a range. Should have been promoted to rank 2."
                     )
@@ -111,7 +103,7 @@ class Selection:
         if max_rank == 3:
             buffer_ranges: dict[Buffer, list[Range]] = {buf: [] for buf in all_buffers}
             for sel in promoted:
-                if not type(sel.selection) is MultiRanges:
+                if type(sel.selection) is not MultiRanges:
                     raise ValueError(
                         f"Selection of rank {sel.rank} is not a multi-range. Should have been promoted to rank 3."
                     )