diff --git a/scripts/Engineering/gui/engineering_diffraction/tabs/fitting/data_handling/data_model.py b/scripts/Engineering/gui/engineering_diffraction/tabs/fitting/data_handling/data_model.py
index 0f1312da95ea8a0f048cd37bd0678b1150516f36..f4beef96820b3e2eb85fca6c458a35d978ba6915 100644
--- a/scripts/Engineering/gui/engineering_diffraction/tabs/fitting/data_handling/data_model.py
+++ b/scripts/Engineering/gui/engineering_diffraction/tabs/fitting/data_handling/data_model.py
@@ -14,7 +14,7 @@ class FittingDataModel(object):
     def __init__(self):
         self._loaded_workspaces = {}  # Map stores using {WorkspaceName: Workspace}
 
-    def load_files(self, filenames_string: str):
+    def load_files(self, filenames_string):
         filenames = [name.strip() for name in filenames_string.split(",")]
         for filename in filenames:
             ws_name = self._generate_workspace_name(filename)
@@ -26,7 +26,7 @@ class FittingDataModel(object):
                     format(filename, e))
 
     def get_loaded_workspaces(self):
-        # TODO: Remove debug line in next PR, when output is visible in the GUI. 
+        # TODO: Remove debug line in next PR, when output is visible in the GUI.
         logger.debug("EngDiff2 Tracked Workspaces: {}".format(self._loaded_workspaces.keys()))
         return self._loaded_workspaces
 
diff --git a/scripts/Engineering/gui/engineering_diffraction/tabs/fitting/data_handling/data_presenter.py b/scripts/Engineering/gui/engineering_diffraction/tabs/fitting/data_handling/data_presenter.py
index af9cb6e7635048c2d9bf29dd3021083ff4d157a6..e80f6b0ebbb11568d8d553af74d4ef15cadaa725 100644
--- a/scripts/Engineering/gui/engineering_diffraction/tabs/fitting/data_handling/data_presenter.py
+++ b/scripts/Engineering/gui/engineering_diffraction/tabs/fitting/data_handling/data_presenter.py
@@ -43,7 +43,7 @@ class FittingDataPresenter(object):
     def get_loaded_workspaces(self):
         return self.model.get_loaded_workspaces()
 
-    def _start_load_worker(self, filenames: str):
+    def _start_load_worker(self, filenames):
         """
         Load one to many files into mantid that are tracked by the interface.
         :param filenames: Comma separated list of filenames to load
@@ -58,7 +58,7 @@ class FittingDataPresenter(object):
         logger.error("Error occurred when loading files.")
         self._emit_enable_button_signal()
 
-    def _enable_load_button(self, enabled: bool):
+    def _enable_load_button(self, enabled):
         self.view.set_load_button_enabled(enabled)
 
     def _emit_enable_button_signal(self):
@@ -73,11 +73,11 @@ class FittingDataPresenter(object):
     def _files_are_valid(self):
         return self.view.get_filenames_valid()
 
-    def _validate(self) -> bool:
+    def _validate(self):
         if self._is_searching():
             create_error_message(self.view, "Mantid is searching for files. Please wait.")
             return False
         elif not self._files_are_valid():
             create_error_message(self.view, "Entered files are not valid.")
             return False
-        return True
\ No newline at end of file
+        return True
diff --git a/scripts/Engineering/gui/engineering_diffraction/tabs/fitting/data_handling/data_widget.py b/scripts/Engineering/gui/engineering_diffraction/tabs/fitting/data_handling/data_widget.py
index b50758a4d3db1079fe518124a1478c8de64e29fc..89073ffea2095a1bd7ed6b3e98c9ae24acd991b0 100644
--- a/scripts/Engineering/gui/engineering_diffraction/tabs/fitting/data_handling/data_widget.py
+++ b/scripts/Engineering/gui/engineering_diffraction/tabs/fitting/data_handling/data_widget.py
@@ -38,4 +38,4 @@ class FittingDataWidget(object):
         self.presenter.clear_workspaces()
 
     def replace_workspace(self, name, workspace):
-        self.presenter.replace_workspace(name, workspace)
\ No newline at end of file
+        self.presenter.replace_workspace(name, workspace)
diff --git a/scripts/Engineering/gui/engineering_diffraction/tabs/fitting/data_handling/test/test_data_presenter.py b/scripts/Engineering/gui/engineering_diffraction/tabs/fitting/data_handling/test/test_data_presenter.py
index 0d2e1be40bff65d1faabfd0afc6d232733dd324f..946ce7125876b59797a882428f099a91147d905f 100644
--- a/scripts/Engineering/gui/engineering_diffraction/tabs/fitting/data_handling/test/test_data_presenter.py
+++ b/scripts/Engineering/gui/engineering_diffraction/tabs/fitting/data_handling/test/test_data_presenter.py
@@ -69,6 +69,5 @@ class FittingDataPresenterTest(unittest.TestCase):
         self.view.sig_enable_load_button.emit.called_with(True)
 
 
-
 if __name__ == '__main__':
     unittest.main()