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 Tkinter Class
#1
Hi,

I need some help understanding the class in the code below. I am using the code to learn from and have searched the internet and have not found any information that I understand.

Why is a class necessary and is this a standard class for Tkinter. What do the contents of the class actually mean? Any help would be appreciated.

Thanks
PE









try:
    import Tkinter
    import ttk
except ImportError:  # Python 3
    import tkinter as Tkinter
    import tkinter.ttk as ttk


class Window(Tkinter.Frame):
    '''
    classdocs
    '''
    def __init__(self, master):
        '''
        Constructor
        '''
        Tkinter.Frame.__init__(self, )
        self.master=master
        self.initialize_user_interface()

    def initialize_user_interface(self):
        """Draw a user interface allowing the user to type
        items and insert them into the treeview
        """
        self.master.title("Canvas Test")
        self.master.grid_rowconfigure(0, weight=1)
        self.master.grid_columnconfigure(0, weight=1)
        self.master.config(background="lavender")

        # Define the different GUI widgets
        self.dose_label = Tkinter.Label(self.master, text="Doserr:")
        self.dose_entry = Tkinter.Entry(self.master)
        self.dose_label.grid(row=0, column=0, sticky=Tkinter.W)
        self.dose_entry.grid(row=0, column=1)

        self.modified_label = Tkinter.Label(self.master,
                                            text="Date Modified:")
        self.modified_entry = Tkinter.Entry(self.master)
        self.modified_label.grid(row=1, column=0, sticky=Tkinter.W)
        self.modified_entry.grid(row=1, column=1)

        self.submit_button = Tkinter.Button(self.master, text="Insert",
                                            command=self.insert_data)
        self.submit_button.grid(row=2, column=1, sticky=Tkinter.W)
        self.exit_button = Tkinter.Button(self.master, text="Exit",
                                          command=self.master.quit)
        self.exit_button.grid(row=0, column=3)

        # Set the treeview
        self.tree = ttk.Treeview(self.master,
                                 columns=('Title', 'Author','Year','ISBN'))
        self.tree.heading('#0', text='Title')
        self.tree.heading('#1', text='Author')
        self.tree.heading('#2', text='Year')
        self.tree.heading('#3', text='ISBN')
        self.tree.column('#1', stretch=Tkinter.YES)
        self.tree.column('#2', stretch=Tkinter.YES)
        self.tree.column('#0', stretch=Tkinter.YES)
        self.tree.column('#3', stretch=Tkinter.YES)
        self.tree.grid(row=4, columnspan=4, sticky='nsew')
        self.treeview = self.tree
        # Initialize the counter
        self.i = 0

    def insert_data(self):
        """
        Insertion method.
        """
        self.treeview.insert('', 'end', text="Item_"+str(self.i),
                             values=(self.dose_entry.get() + " mg",
                                     self.modified_entry.get()))
        # Increment counter
        self.i = self.i + 1


def main():
    root=Tkinter.Tk()
    d=Window(root)
    root.mainloop()

if __name__=="__main__":
    main()
Quote
#2
A class is a container for a bunch of related functions, which once they become part of the class are now referred to as methods.
the __init__ method is used to initialize any inherited classes, define variables that are used throught the class, and any other objects that need to be initialized.

This class inherits tkinter.Frame, so initializes that class, and makes master visible to all methods and then executes the initialize_user_interface method which sets up the widgets being use by the application.

Once the class has been created, new instances of the class can be created simply by using simple syntax x = MyClass()

You really ought to read up on classes as they are a bit complex

here are a couple of links:
https://www.w3schools.com/python/python_classes.asp
and the python doc:
https://docs.python.org/3/tutorial/classes.html
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