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from Tkinter import *
import math
root = Tk()
top = Frame(root)
top.pack(side='top')
font = 'times 18 bold'
hwtext = Label(top, text='Hello, World!', font=font)
hwtext.grid(row=0, column=0, columnspan=4, pady=20)
r_label = Label(top, text='The sine of')
r_label.grid(row=1, column=0)
r = StringVar()
r.set('1.2')
r_entry = Entry(top, width=6, textvariable=r)
r_entry.grid(row=1, column=1)
s = StringVar()
def comp_s(event=None):
global s
s.set('%g' % math.sin(float(r.get()))) # construct string
r_entry.bind('<Return>', comp_s)
compute = Button(top, text=' equals ', command=comp_s, relief='flat')
compute.grid(row=1, column=2)
s_label = Label(top, textvariable=s, width=12)
s_label.grid(row=1, column=3)
def quit(event=None):
root.destroy()
quit_button = Button(top, text='Goodbye, GUI World!', command=quit,
background='yellow', foreground='blue')
quit_button.grid(row=2, column=0, columnspan=4, pady=5, sticky='ew')
root.bind('<q>', quit)
root.mainloop()
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