Do not add unnecessary row names (#37)

update tests as well

src/biocframe/BiocFrame.py

@@ -347,7 +347,7 @@ def column(self, index_or_name: Union[str, int]) -> Any:
                 "`index_or_name` must be either an integer index or column name."
             )
 
-        return self[:, index_or_name]
+        return self[None, index_or_name]
 
     def row(self, index_or_name: Union[str, int]) -> dict:
         """Access a row by integer position or row name.
@@ -374,7 +374,7 @@ def row(self, index_or_name: Union[str, int]) -> dict:
                 "`index_or_name` must be either an integer index or row name."
             )
 
-        return self[index_or_name, :]
+        return self[index_or_name, None]
 
     def _slice(
         self,

tests/test_initialize.py

@@ -109,3 +109,9 @@ def test_nested_biocFrame():
 
     bframe = BiocFrame(obj)
     assert bframe is not None
+
+    nested_col = bframe.column("nested")
+    assert nested_col is not None
+    assert isinstance(nested_col, BiocFrame)
+    assert nested_col.row_names is None
+    assert len(nested_col.column_names) == 3