title: Python GUI Graphics Calculator
body: <p>I am trying to make a store calculator from the graphics library and my program keeps crashing due to unknown reasons. Just whenever I click the calculate button, it stops running and I get no output. Here is what I have as of now:</p>
  
  <pre><code>#   graphical interface.
  from graphics import *
  def main():
  win = GraphWin("Celsius Converter", 600, 500)
  win.setCoords(0.0, 0.0, 3.0, 4.0)
  
  # Draw the interface
  Text(Point(1,3.9), "   Enter name:").draw(win)
  Text(Point(1,3.7), "   Crunchy tacos at $1.99 each:").draw(win)
  Text(Point(1,3.5), "   Soft tacos at $2.09 each:").draw(win)
  Text(Point(1,3.3), "   Bean burritos at $2.49 each:").draw(win)
  Text(Point(1,3.1), "   Chicken burritos at $2.99 each:").draw(win)
  Text(Point(1,2.9), "   Taco salads at $3.49 each:").draw(win)
  Text(Point(1,2.7), "   Extra salsa at $.30 each:").draw(win)
  Text(Point(1,1), "Due:").draw(win)
  input1 = Entry(Point(2,3.9), 5)
  input1.setText("Name")
  input1.draw(win)
  input2 = Entry(Point(2,3.7), 5)
  input2.setText("0")
  input2.draw(win)
  input3 = Entry(Point(2,3.5), 5)
  input3.setText("0")
  input3.draw(win)
  input4 = Entry(Point(2,3.3), 5)
  input4.setText("0")
  input4.draw(win)
  input5 = Entry(Point(2,3.1), 5)
  input5.setText("0")
  input5.draw(win)
  input6 = Entry(Point(2,2.9), 5)
  input6.setText("0")
  input6.draw(win)
  input7 = Entry(Point(2,2.7), 5)
  input7.setText("0")
  input7.draw(win)
  output = Text(Point(2,1),"")
  output.draw(win)
  button = Text(Point(1.5,2.0),"Calculate")
  button.draw(win)
  Rectangle(Point(1,1.5), Point(2,2.5)).draw(win)
  # wait for a mouse click
  win.getMouse()
  
  # convert input
  name = input1.getText()
  crunchy = float(input2.getText()) * 1.99
  soft = float(input3.getText()) * 2.09
  bean = float(input4.getText()) * 2.49
  chicken = float(input5.getText()) * 2.99
  salad = float(input6.getText()) * 3.49
  salsa = float(input7.getText()) * 0.30
  costBefore = (crunchy + soft + bean + chicken + salad + salsa)
  tax = 0.075 * costBefore
  cost = costBefore + tax
  
  # display output and change button
  output.setText("Hello", name, ",your total is: ", cost)
  button.setText("Quit")
  
  # wait for click and then quit
  win.getMouse()
  win.close()
  
  main()
  </code></pre>