StringVar and Label variable : Label « GUI Tk « Python

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Python » GUI Tk » LabelScreenshots 
StringVar and Label variable
 

from Tkinter import *
import math

root = Tk()   
top = Frame(root)
top.pack(side='top') 

hwframe = Frame(top)
hwframe.pack(side='top')
hwtext = Label(hwframe, text='Hello, World!')
hwtext.pack(side='top') 

rframe = Frame(top)
rframe.pack(side='top')
r_label = Label(rframe, text='The sine of')
r_label.pack(side='left')
r = StringVar() 
r.set('1.2')    
r_entry = Entry(rframe, width=6, textvariable=r)
r_entry.pack(side='left')

s = StringVar() 
def comp_s(event):
    global s
    s.set('%g' % math.sin(float(r.get()))) # construct string

r_entry.bind('<Return>', comp_s)

compute = Label(rframe, text=' equals ')
compute.pack(side='left')

s_label = Label(rframe, textvariable=s, width=12)
s_label.pack(side='left')

def quit(event=None):
    root.destroy()

quit_button = Button(top, text='Goodbye, GUI World!', command=quit)
quit_button.pack(side='top')

root.bind('<q>', quit)

root.mainloop()

   
  
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