ToCSV uses duplicate_last_bin option for to_csv method when possible.

lena/output/to_csv.py

@@ -135,8 +135,18 @@ def is_writable_hist(val):
                 continue
 
             if hasattr(data, "to_csv") and callable(data.to_csv):
-                text = data.to_csv(separator=self._separator,
-                                      header=self._header)
+                try:
+                    # some classes (like Graph) can have to_csv
+                    # without duplicate_last_bin keyword.
+                    # If it is present, use it.
+                    text = data.to_csv(
+                        separator=self._separator, header=self._header,
+                        duplicate_last_bin=self._duplicate_last_bin
+                    )
+                except TypeError:
+                    text = data.to_csv(
+                        separator=self._separator, header=self._header
+                    )
                 ## *data.to_csv* may produce context,
                 ## which in this case updates the current context.
                 # no need to allow this. All necessary context

lena/output/writer.py

@@ -63,20 +63,19 @@ def _make_filename(self, outputc):
             filepath = filename + "." + fileext
         else:
             filepath = filename
-        def normalize_path(pathname, path):
+        def normalize_path(path_name, path):
             if os.path.isabs(path):
                 warnings.warn(
                     "{} must not be absolute path, {} given"
-                    .format(pathname, path),
+                    .format(path_name, path),
                     RuntimeWarning
                 )
                 if path.startswith(os.sep):
                     # there can be also os.altsep for some fancy systems
-                    path= path[len(os.sep):]
+                    path = path[len(os.sep):]
                     assert not os.path.isabs(path)
             return path
         dirname = normalize_path("dirname", dirname)
-        # filepath is an internal variable created from filename
         filepath = normalize_path("filename", filepath)
         filepath = os.path.join(self.output_directory, dirname, filepath)