Sc 107/default extention file selection

What's new:

• Automatically goes to the correct dir, depending if you look for shadows or source files!
• Has .csv as default instead of .txt
• Added .TextGrid as option
• Title of file selection window dependent on whether you look for source or shadow files
• File selection function has no code duplication anymore
• Layout of code in some other files is fixed to meet PEP standards

mvc/controller.py

@@ -2,6 +2,7 @@
 from tkinter.filedialog import *
 import os
 
+
 class ControllerClass:
     """Here the controller is located. Add all functionality as separate
     functions.
@@ -29,19 +30,23 @@ class ControllerClass:
 
         # Menu bindings, adds menu commands as well as where some specific
         # elements such as separators are.
-        self.view.options_menu.add_command(label="Saving options",
-             command=self.view.save_options_view.sav_opts_window.deiconify)
+        self.view.options_menu.add_command(
+            label="Saving options",
+            command=self.view.save_options_view.sav_opts_window.deiconify
+            )
         self.view.options_menu.add_separator()
         self.view.options_menu.add_command(label="Exit",
                                            command=self.view.window.quit)
 
         # Bindings for the actual options view
-        self.view.save_options_view.cancel_button_so.bind("<Button>",
-            lambda x: self.view.save_options_view.sav_opts_window.withdraw())
-
-        self.view.save_options_view.save_button_so.bind("<Button>",
-            lambda x: self.set_curr_save_pref())
-
+        self.view.save_options_view.cancel_button_so.bind(
+            "<Button>",
+            lambda x: self.view.save_options_view.sav_opts_window.withdraw()
+            )
+        self.view.save_options_view.save_button_so.bind(
+            "<Button>",
+            lambda x: self.set_curr_save_pref()
+            )
         # Initialize preference values in view based on the model
         self.view.save_options_view.curr_option.set(self.model.get_save_pref())