Return the indexes of PandasBlock as tuple.

cml/ports/source_adapters.py

@@ -69,11 +69,14 @@ class PandasBlock:
 
     def get_duplicated_pairs(self, *args):
         bool_series = self.__data_block.duplicated(subset=[args[0], args[1]])
-
         duplicates = self.__data_block[bool_series]
         for i, j in zip(duplicates[args[0]], duplicates[args[1]]):
             yield i, j
 
+    @property
+    def indexes(self):
+        return tuple(self.__data_block.index)
+
     def get_values(self, **kwargs):
         t, z, sigma = kwargs.get("T"), kwargs.get("Z"), kwargs.get("Sigma")