tkinterTutorial.py

   1 #!/usr/bin/python3
   2
   3 from tkinter import *
   4 from tkinter import ttk
   5 # define calculate function
   6 def calculate(*args):
   7     try:
   8         value=float(feet.get())
   9         meters.set(int(0.3048 * value * 10000.0 + 0.5)/1000.0)
  10     except ValueError:
  11         pass
  12 # Set up Main Application Window
  13 root=Tk()
  14 root.title("Feet to Meters")
  15
  16 # Create Content Frame
  17 mainframe=ttk.Frame(root, padding="3 3 12 12")
  18 # Put grid in Content Frame
  19 mainframe.grid(column=0, row=0, sticky=(N, W, E, S))
  20 root.columnconfigure(0, weight=1)
  21 root.rowconfigure(0, weight=1)
  22 # Create entry widget
  23 feet=StringVar()
  24 feet_entry=ttk.Entry(mainframe, width=7, textvariable=feet)
  25 feet_entry.grid(column=2, row=1, sticky=(W, E))
  26 # Create remaining widgets
  27 meters=StringVar()
  28 ttk.Label(mainframe, textvariable=meters).grid(column=2, row=2,
  29 sticky=(W,E))
  30
  31 ttk.Button(mainframe, text='Calculate', command=calculate).grid(column =3,
  32 row=3, sticky=W)
  33
  34 ttk.Label(mainframe, text="feet").grid(column=3, row=1, sticky=W)
  35 ttk.Label(mainframe, text="is equivalent to").grid(column=1, row=2, sticky=E)
  36 ttk.Label(mainframe, text="meters").grid(column=3, row=2, sticky=W)
  37 # finishing touches
  38 for child in mainframe.winfo_children():
  39     child.grid_configure(padx=5, pady=5)
  40
  41 feet_entry.focus()
  42 root.bind("<Return>", calculate)
  43 # Tkinter event loop
  44 root.mainloop()