You seem to be interested only in how to insert data the user types within Tkinter.Entry() widgets into ttk.Treeview() after a Tkinter.Button() click.

I designed a simple interface to show you how to resolve this. You can adapt my solution to your problem.

Here is how the application demo looks like:

So I set a counter self.i to name the items. But you can add a label and an entry for this purpose instead and you insert items names similarly to the the other Tkinter.Entry() entries.

The insertion method is this one:

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

May be the main trick here is to retrieve the data the user types using get() method which thing is represented by self.dose_entry.get() and self.dose_modified.get() actions.

This is done, you need now to bind this method to the button to be pressed to trigger the insertion action using the command option:

self.submit_button = Tkinter.Button(self.parent, text="Insert",                                    command=self.insert_data)

Full program:

'''Created on Mar 21, 2016@author: Bill Begueradj'''try:    import Tkinter    import ttkexcept ImportError:  # Python 3    import tkinter as Tkinter    import tkinter.ttk as ttkclass Begueradj(Tkinter.Frame):    '''    classdocs    '''    def __init__(self, parent):        '''        Constructor        '''        Tkinter.Frame.__init__(self, parent)        self.parent=parent        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.parent.title("Canvas Test")        self.parent.grid_rowconfigure(0, weight=1)        self.parent.grid_columnconfigure(0, weight=1)        self.parent.config(background="lavender")        # Define the different GUI widgets        self.dose_label = Tkinter.Label(self.parent, text="Dose:")        self.dose_entry = Tkinter.Entry(self.parent)        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.parent,                                            text="Date Modified:")        self.modified_entry = Tkinter.Entry(self.parent)        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.parent, text="Insert",                                            command=self.insert_data)        self.submit_button.grid(row=2, column=1, sticky=Tkinter.W)        self.exit_button = Tkinter.Button(self.parent, text="Exit",                                          command=self.parent.quit)        self.exit_button.grid(row=0, column=3)        # Set the treeview        self.tree = ttk.Treeview(self.parent,                                 columns=('Dose', 'Modification date'))        self.tree.heading('#0', text='Item')        self.tree.heading('#1', text='Dose')        self.tree.heading('#2', text='Modification Date')        self.tree.column('#1', stretch=Tkinter.YES)        self.tree.column('#2', stretch=Tkinter.YES)        self.tree.column('#0', 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 + 1def main():    root=Tkinter.Tk()    d=Begueradj(root)    root.mainloop()if __name__=="__main__":    main()

Note:

I coded this in Python 2.7, but it should work if you're using Python 3.x.