diff --git a/python/plugins/processing/gui/ScriptEditorDialog.py b/python/plugins/processing/gui/ScriptEditorDialog.py
index f7a3dc13a4e..c07f78dab7c 100644
--- a/python/plugins/processing/gui/ScriptEditorDialog.py
+++ b/python/plugins/processing/gui/ScriptEditorDialog.py
@@ -141,7 +141,7 @@ class ScriptEditorDialog(BASE, WIDGET):
 
     def showSnippets(self, evt):
         popupmenu = QMenu()
-        for name, snippet in self.snippets.iteritems():
+        for name, snippet in list(self.snippets.items()):
             action = QAction(self.tr(name), self.btnSnippets)
             action.triggered[()].connect(lambda snippet=snippet: self.editor.insert(snippet))
             popupmenu.addAction(action)
@@ -163,9 +163,9 @@ class ScriptEditorDialog(BASE, WIDGET):
     def editHelp(self):
         if self.alg is None:
             if self.algType == self.SCRIPT_PYTHON:
-                alg = ScriptAlgorithm(None, unicode(self.editor.text()))
+                alg = ScriptAlgorithm(None, self.editor.text())
             elif self.algType == self.SCRIPT_R:
-                alg = RAlgorithm(None, unicode(self.editor.text()))
+                alg = RAlgorithm(None, self.editor.text())
         else:
             alg = self.alg
 
@@ -221,7 +221,7 @@ class ScriptEditorDialog(BASE, WIDGET):
                 scriptDir = RUtils.RScriptsFolders()[0]
                 filterName = self.tr('Processing R script (*.rsx)')
 
-            self.filename = unicode(QFileDialog.getSaveFileName(self,
+            self.filename = str(QFileDialog.getSaveFileName(self,
                                                                 self.tr('Save script'), scriptDir,
                                                                 filterName))
 
@@ -233,7 +233,7 @@ class ScriptEditorDialog(BASE, WIDGET):
                     not self.filename.lower().endswith('.rsx'):
                 self.filename += '.rsx'
 
-            text = unicode(self.editor.text())
+            text = self.editor.text()
             if self.alg is not None:
                 self.alg.script = text
             try:
@@ -242,7 +242,7 @@ class ScriptEditorDialog(BASE, WIDGET):
             except IOError:
                 QMessageBox.warning(self, self.tr('I/O error'),
                                     self.tr('Unable to save edits. Reason:\n %s')
-                                    % unicode(sys.exc_info()[1])
+                                    % str(sys.exc_info()[1])
                                     )
                 return
             self.update = True
@@ -263,10 +263,10 @@ class ScriptEditorDialog(BASE, WIDGET):
 
     def runAlgorithm(self):
         if self.algType == self.SCRIPT_PYTHON:
-            alg = ScriptAlgorithm(None, unicode(self.editor.text()))
+            alg = ScriptAlgorithm(None, self.editor.text())
             alg.provider = algList.getProviderFromName('script')
         if self.algType == self.SCRIPT_R:
-            alg = RAlgorithm(None, unicode(self.editor.text()))
+            alg = RAlgorithm(None, self.editor.text())
             alg.provider = algList.getProviderFromName('r')
 
         dlg = alg.getCustomParametersDialog()