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

 # The controller class
 from tkinter.filedialog import *
-
+import os
 
 class ControllerClass:
     """Here the controller is located. Add all functionality as separate
@@ -14,10 +14,14 @@ class ControllerClass:
         self.model = model
 
         # Button bindings. Lambda is to pass argument to select_file
-        self.view.button_source.bind("<Button>", lambda x: self.select_file(1))
-        self.view.button_delete_source.bind("<Button>", lambda x: self.delete_file("source"))
-        self.view.button_shadow.bind("<Button>", lambda x: self.select_file(2))
-        self.view.button_delete_shadow.bind("<Button>", lambda x: self.delete_file("shadow"))
+        self.view.button_source.bind("<Button>", lambda x: self.select_file(
+            "source"))
+        self.view.button_delete_source.bind("<Button>", lambda x: self.
+                                            delete_file("source"))
+        self.view.button_shadow.bind("<Button>", lambda x: self.select_file(
+            "shadow"))
+        self.view.button_delete_shadow.bind("<Button>", lambda x: self.
+                                            delete_file("shadow"))
         self.view.comparison_button.bind("<Button>",
                                          lambda x: self.check_for_files())
         self.view.save_button.bind("<Button>",
@@ -47,25 +51,38 @@ class ControllerClass:
     def update_view(self):
         self.view.window.after(1)
 
-    def select_file(self, fileno):
-        """Function for selecting a file from the local computer. Assume .txt
-        upload format.
+    def select_file(self, file_type):
+        """Function for selecting a file from the local computer. Assume .csv
+        or .txt upload format.
         First it gets the file path and then save it in the model, then updates
-        view
+        view.
+
+        Args:
+            file_type: "source" for selecting source, "shadow" for shadow
         """
-        file_paths = askopenfilenames(filetypes=((".txt files", "*.txt"),
-                                                 ("all files", "*.*")))
+        # Extract the path to this project to use as intialdir for selection:
+        dirpath = os.getcwd()
+        basename = os.path.basename(dirpath)
+        datapath = dirpath.split(basename)[0] + "DataAndMatLabScript"
+        if file_type == "source":
+            datapath += r"\sourcefiles"
+        else:
+            datapath += r"\shadowedfiles"
+
+        file_paths = askopenfilenames(
+            initialdir=datapath,  # If not found, then not a problem.
+            title="",
+            defaultextension='.csv',
+            filetypes=(("Comma-separated values", "*.csv"),
+                       ("TextGrid", "*.TextGrid"),
+                       ("Text files", "*.txt"),
+                       ("all files", "*.*"))
+            )
         for file_path in file_paths:
             if file_path != "":  # Do not assign an empty file path
                 label_text = file_path.title().split("/")[-1]
-
-                if fileno == 1:
-                    self.model.add_file(file_path, "source")
-                    self.view.add_file_entry(label_text, "source")
-                else:
-                    self.model.add_file(file_path, "shadow")
-                    self.view.add_file_entry(label_text, "shadow")
-
+                self.model.add_file(file_path, file_type)
+                self.view.add_file_entry(label_text, file_type)
         self.update_view()
 
     # I find the naming here ill defined. Maybe it would be