The goal for this iteration is to implement the functionality of the File menu options: Open, Save, and Save As.
We can implement these dialogs by using the standard Tkinter widgets. However, since these are so commonly used, a specific Tkinter module called filedialog has been included in the standard Tkinter distribution.
Here's an example of a typical filedialog:
Tkinter defines the following common use cases for filedialogs:
|askopenfile||This returns the opened file object|
|askopenfilename||This returns the filename string, not the opened file object|
|askopenfilenames||This returns ...|