Tk Tutorial - 3. A First (Real) Example

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Design

The example we'll use is a simple GUI tool that will convert a number of feet to the equivalent number of meters.

from tkinter import *from tkinter import ttkdef calculate(*args):    try:        value = float(feet.get())        meters.set((0.3048 * value * 10000.0 + 0.5)/10000.0)    except ValueError:        pass    root = Tk()root.title("Feet to Meters")mainframe = ttk.Frame(root, padding="3 3 12 12")mainframe.grid(column=0, row=0, sticky=(N, W, E, S))mainframe.columnconfigure(0, weight=1)mainframe.rowconfigure(0, weight=1)feet = StringVar()meters = StringVar()feet_entry = ttk.Entry(mainframe, width=7, textvariable=feet)feet_entry.grid(column=2, row=1, sticky=(W, E))ttk.Label(mainframe, textvariable=meters).grid(column=2, row=2, sticky=(W, E))ttk.Button(mainframe, text="Calculate", command=calculate).grid(column=3, row=3, sticky=W)ttk.Label(mainframe, text="feet").grid(column=3, row=1, sticky=W)ttk.Label(mainframe, text="is equivalent to").grid(column=1, row=2, sticky=E)ttk.Label(mainframe, text="meters").grid(column=3, row=2, sticky=W)for child in mainframe.winfo_children(): child.grid_configure(padx=5, pady=5)feet_entry.focus()root.bind('<Return>', calculate)root.mainloop()

from: http://www.tkdocs.com/tutorial/firstexample.html

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