diff --git a/sohstationviewer/view/main_window.py b/sohstationviewer/view/main_window.py
index 6ee524b28dfc9e32efadd40af329168189c41a8e..63239d441f480ca4f1e0fcc1ec3c3cad65c22da2 100755
--- a/sohstationviewer/view/main_window.py
+++ b/sohstationviewer/view/main_window.py
@@ -1144,8 +1144,8 @@ class MainWindow(QtWidgets.QMainWindow, UIMainWindow):
         self.current_directory_changed.emit(path)
         self.current_dir = path
         self.save_plot_dir = path
-        execute_db(f'UPDATE PersistentData SET FieldValue="{path}" WHERE '
-                   'FieldName="currentDirectory"')
+        execute_db(f"UPDATE PersistentData SET FieldValue='{path}' WHERE "
+                   "FieldName='currentDirectory'")
         self.set_open_files_list_texts()
 
     def set_open_files_list_texts(self):
@@ -1211,8 +1211,8 @@ class MainWindow(QtWidgets.QMainWindow, UIMainWindow):
         Set current directory with info saved in DB
         """
         rows = execute_db_dict(
-            'SELECT FieldName, FieldValue FROM PersistentData '
-            'WHERE FieldName="currentDirectory"')
+            "SELECT FieldName, FieldValue FROM PersistentData "
+            "WHERE FieldName='currentDirectory'")
         if len(rows) > 0 and rows[0]['FieldValue']:
             self.set_current_directory(rows[0]['FieldValue'])
 
@@ -1302,14 +1302,14 @@ class MainWindow(QtWidgets.QMainWindow, UIMainWindow):
             SOHView wasn't closed correctly.
         """
         rows = execute_db(
-            'SELECT FieldValue FROM PersistentData '
-            'WHERE FieldName="tempDataDirectory"')
+            "SELECT FieldValue FROM PersistentData "
+            "WHERE FieldName='tempDataDirectory'")
         temp_data_folder = rows[0][0]
         try:
             shutil.rmtree(temp_data_folder)
             execute_db(
-                f'UPDATE PersistentData SET FieldValue="{None}" WHERE'
-                f' FieldName="tempDataDirectory"'
+                f"UPDATE PersistentData SET FieldValue='{None}' WHERE"
+                f" FieldName='tempDataDirectory'"
             )
         except (FileNotFoundError, TypeError):
             pass