TYP: use Shape alias in core/indexes/base.py

Author: arw2019

pandas/core/indexes/base.py

@@ -26,7 +26,7 @@
 from pandas._libs.lib import is_datetime_array, no_default
 from pandas._libs.tslibs import IncompatibleFrequency, OutOfBoundsDatetime, Timestamp
 from pandas._libs.tslibs.timezones import tz_compare
-from pandas._typing import AnyArrayLike, Dtype, DtypeObj, Label
+from pandas._typing import AnyArrayLike, Dtype, DtypeObj, Label, Shape
 from pandas.compat.numpy import function as nv
 from pandas.errors import DuplicateLabelError, InvalidIndexError
 from pandas.util._decorators import Appender, cache_readonly, doc
@@ -5533,7 +5533,7 @@ def _maybe_disable_logical_methods(self, opname: str_t):
             make_invalid_op(opname)(self)
 
     @property
-    def shape(self):
+    def shape(self) -> Shape:
         """
         Return a tuple of the shape of the underlying data.
         """