1. from Tkinter import *
2. import tkFileDialog, tkMessagebox
3.  
4. class App:
5.  
6. def __init__(self, master):
7.     self.master = master
8.  
9.     #call start to initialize to create the UI elemets
10.     self.start()
11.  
12. def start(self):
13.     self.master.title("This is the title of the 'Window'")
14.  
15.     self.now = datetime.datetime.now()
16.  
17.     #CREATE A TEXT/LABEL
18.     #create a variable with text
19.     label01 = "This is some text"
20.     #put "label01" in "self.master" which is the window/frame
21.     #then, put in the first row (row=0) and in the 2nd column (column=1), align it to "West"/"W"
22.     Label(self.master, text=label01).grid(row=0, column=0, sticky=W)
23.  
24.     #CREATE A TEXTBOX
25.     self.filelocation = Entry(self.master)
26.     self.filelocation["width"] = 60
27.     self.filelocation.focus_set()
28.     self.filelocation.grid(row=1,column=0)
29.  
30.     #CREATE A BUTTON WITH "ASK TO OPEN A FILE"
31.     self.open_file = Button(self.master, text="Browse...", command=self.browse_file) #see: def browse_file(self)
32.     self.open_file.grid(row=1, column=1) #put it beside the filelocation textbox
33.  
34.     #CREATE RADIO BUTTONS
35.     RADIO_BUTTON = [
36.         ("This will display A", "A"),
37.         ("This will display B","B")
38.     ]
39.  
40.     #initialize a variable to store the selected value of the radio buttons
41.     #set it to A by default
42.     self.radio_var = StringVar()
43.     self.radio_var.set("A")
44.  
45.     #create a loop to display the RADIO_BUTTON
46.     i=0
47.     for text, item in RADIO_BUTTON:
48.         #setup each radio button. variable is set to the self.radio_var
49.         #and the value is set to the "item" in the for loop
50.         self.radio = Radiobutton(self.master, text=text, variable=radio_var, value=item)
51.         self.radio.grid(row=2, column=i)
52.         i += 1
53.  
54.     #now for a button
55.     self.submit = Button(self.master, text="Execute!", command=self.start_processing, fg="red")
56.     self.submit.grid(row=3, column=0)
57.  
58. def start_processing(self):
59.     #more code here
60.  
61. def browse_file(self):
62.     #put the result in self.filename
63.     self.filename = tkFileDialog.askopenfilename(title="Open a file...")
64.  
65.     #this will set the text of the self.filelocation
66.     self.filelocation.insert(0,self.filename)
67. root = Tk()
68. app = App(root)
69. root.mainloop()