add return type

Author: jorisvandenbossche

pandas/core/frame.py

@@ -1747,7 +1747,7 @@ def __rmatmul__(self, other) -> DataFrame:
     # IO methods (to / from other formats)
 
     @classmethod
-    def from_arrow(cls, data):
+    def from_arrow(cls, data) -> DataFrame:
         """
         Construct a DataFrame from a tabular Arrow object.