convert_gui.py

#program to convert Celsius to Fahrenheit using
#a simple graphical interface

from graphics import *

def main ():
    win = GraphWin("Celsius Converter", 400, 300)
    win.setCoords(0.0, 0.0, 3.0, 4.0)

    #Draw interface
    Text(Point(1,3), "Celsius Temperature:").draw(win)
    Text(Point(1,1), "Fahrenheit Temperature:").draw(win)
    input = Entry(Point(2,3), 5)
    input.setText("0.0")
    input.draw(win)
    output = Text(Point(2,1), "")
    output.draw(win)
    button = Text(Point(1.5,2.0), "Convert It")
    button.draw(win)
    Rectangle(Point(1,1.5), Point(2,2.5)).draw(win)

    #wait for mouse click
    win.getMouse()

    # convert input
    celsius = eval(input.getText())
    fahrenheit = 9.0/5.0 * celsius + 32

    #display output and change button
    output.setText(fahrenheit)
    button.setText("Quit")

    #wait for click and then Quit
    win.getMouse()
    win.close()

main()