type RangeIndex properties (#1115)

Author: MarcoGorelli

pandas-stubs/core/indexes/range.pyi

@@ -24,9 +24,12 @@ class RangeIndex(Index[int]):
     @classmethod
     def from_range(cls, data, name=..., dtype=...): ...
     def __reduce__(self): ...
-    def start(self): ...
-    def stop(self): ...
-    def step(self): ...
+    @property
+    def start(self) -> int: ...
+    @property
+    def stop(self) -> int: ...
+    @property
+    def step(self) -> int: ...
     @property
     def nbytes(self) -> int: ...
     def memory_usage(self, deep: bool = ...) -> int: ...

tests/test_indexes.py

@@ -252,6 +252,13 @@ def test_range_index_union():
     )
 
 
+def test_range_index_start_stop_step():
+    idx = pd.RangeIndex(3)
+    check(assert_type(idx.start, int), int)
+    check(assert_type(idx.stop, int), int)
+    check(assert_type(idx.step, int), int)
+
+
 def test_interval_range():
     check(
         assert_type(pd.interval_range(0, 10), "pd.IntervalIndex[pd.Interval[int]]"),