from Tkinter import * # use Tkinter GUI toolkit, import it entirely into this namespace
import math
import tkMessageBox 
import myhypotenuse 
class hypotenuseGUI:  # here's the GUI code, separate from the machinery of the calculation
	def __init__(self, master): 
		self.mainframe = Frame(master) # make a frame to be our main window
                                       # Because we imported the Tkinter module entirely, 
                                        #  we don't have to use Tkinter.Frame
		self.mainframe.pack() 
		frame1 = Frame(self.mainframe) # make a subframe to group elements for layout
		frame1.pack(side=TOP)
		Label(frame1, text="Side 1 ", width=50).pack(side=LEFT)     # just a visual label
		side1 = StringVar(master) # use a string variable, convert later into numerical data 
		Entry(frame1, variable=side1).pack(side=LEFT)               # data entry field 
		Label(frame1, text="Side 2 ", width=50).pack(side=LEFT)
		side2 = StringVar(master)
		Entry(frame1, variable=side2).pack(side=LEFT) 
		frame2 = Frame(self.mainframe)
		frame2.pack(side=TOP)
		Button(frame2, text="Calculate Hypotenuse", 
				command=self.getHypotenuse).pack(side=LEFT)
		self.answer = Label(frame2, text="answer goes here", width=50)
		self.answer.pack(side=LEFT)
		Button(frame2, text=quit, command=onQuit).pack(side=LEFT) 
	def getHypotenuse(self): 
		try: 
			value1 = float(side1.get())
			value2 = float(side2.get())
		except ValueError:  # something couldn't be interpreted as a floating point value
			tkMessageBox.showinfo("Error", "Unacceptable value for side of triangle")
		else:
			hyp1 = myhypotenuse.hypotenuse(value1, value2)
			hyp_answer = hyp1.calculate()
			self.answer.text = hyp_answer 
	def onQuit(self): 
		self.mainframe.quit()
root = Tk()                    # define a root GUI object/window
app = hypotenuseGUI(root)      # create an instance of the GUI class based on the root
root.mainloop()                # start the GUI event loop