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POMake clear button backspace by one in python tkinter calculator
 

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  1. POMake clear button backspace by one in python tkinter calculator
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    <p>I am making a calculator in python using tkinter. The calculator works very well apart from one thing. At the moment I have set the calculator to clear the display. I want to make it so that it clears the last number on the display. For example 564 would become 56.</p> <p>Any help greatly appreciated.</p> <pre><code>#Import tkinter from Tkinter import * #Setup quit button def quit(): window.destroy() #What happens when you click the button def buttonclick(event): global calcvalue global savedvalue global operator pressed = "" if event.x &gt;10 and event.x &lt;70 and event.y &gt; 50 and event.y &lt; 110 : pressed = 7 if event.x &gt;10 and event.x &lt;70 and event.y &gt; 120 and event.y &lt; 180 : pressed = 4 if event.x &gt;10 and event.x &lt;70 and event.y &gt; 190 and event.y &lt; 250 : pressed = 1 if event.x &gt;10 and event.x &lt;70 and event.y &gt; 260 and event.y &lt; 320 : pressed = 0 if event.x &gt;80 and event.x &lt;140 and event.y &gt; 50 and event.y &lt; 110 : pressed = 8 if event.x &gt;80 and event.x &lt;140 and event.y &gt; 120 and event.y &lt; 180 : pressed = 5 if event.x &gt;80 and event.x &lt;140 and event.y &gt; 190 and event.y &lt; 250 : pressed = 2 if event.x &gt;150 and event.x &lt;210 and event.y &gt; 50 and event.y &lt; 110 : pressed = 9 if event.x &gt;150 and event.x &lt;210 and event.y &gt; 120 and event.y &lt; 180 : pressed = 6 if event.x &gt;150 and event.x &lt;210 and event.y &gt; 190 and event.y &lt; 250 : pressed = 3 if event.x &gt;80 and event.x &lt;140 and event.y &gt; 260 and event.y &lt; 320 : pressed = "equals" if event.x &gt;150 and event.x &lt;210 and event.y &gt; 260 and event.y &lt; 320 : pressed = "clear" if event.x &gt;220 and event.x &lt;280 and event.y &gt; 50 and event.y &lt; 110 : pressed = "divide" if event.x &gt;220 and event.x &lt;280 and event.y &gt; 120 and event.y &lt; 180 : pressed = "times" if event.x &gt;220 and event.x &lt;280 and event.y &gt; 190 and event.y &lt; 250 : pressed = "minus" if event.x &gt;220 and event.x &lt;280 and event.y &gt; 260 and event.y &lt; 320 : pressed = "plus" if pressed == 0 or pressed == 1 or pressed == 2 or pressed == 3 or pressed == 4 or pressed == 5 or pressed == 6 or pressed == 7 or pressed == 8 or pressed == 9 : calcvalue = calcvalue * 10 + pressed if pressed == "divide" or pressed == "times" or pressed == "minus" or pressed == "plus" : operator = pressed savedvalue = calcvalue calcvalue = 0 if pressed == "equals": if operator == "divide": calcvalue = savedvalue /calcvalue if operator == "times": calcvalue = savedvalue * calcvalue if operator == "minus": calcvalue = savedvalue - calcvalue if operator == "plus": calcvalue = savedvalue + calcvalue if pressed == "clear": calcvalue = 0 displayupdate() canvas.update() #Setup the display def displayupdate(): canvas.create_rectangle(10, 10, 370, 40, fill="white", outline="black") canvas.create_text(350, 25, text=calcvalue,font="Times 20 bold",anchor=E) #Setup the canvas/window def main(): global window global tkinter global canvas window = Tk() window.title("BIG Calculator") Button(window, text="Quit", width=5, command=quit).pack() canvas = Canvas(window, width= 380, height=330, bg = 'black') canvas.bind("&lt;Button-1&gt;", buttonclick) #Add the 1 2 3 4 5 6 7 8 9 0 buttons canvas.create_rectangle(10, 50, 100, 110, fill="white", outline="black") canvas.create_text(45, 80, text="7",font="Times 30 bold") canvas.create_rectangle(10, 120, 100, 180, fill="white", outline="black") canvas.create_text(45, 150, text="4",font="Times 30 bold") canvas.create_rectangle(10, 190, 100, 250, fill="white", outline="black") canvas.create_text(45, 220, text="1",font="Times 30 bold") canvas.create_rectangle(10, 260, 100, 320, fill="white", outline="black") canvas.create_text(45, 290, text="0",font="Times 30 bold") canvas.create_rectangle(80, 50, 170, 110, fill="white", outline="black") canvas.create_text(115, 80, text="8",font="Times 30 bold") canvas.create_rectangle(80, 120, 170, 180, fill="white", outline="black") canvas.create_text(115, 150, text="5",font="Times 30 bold") canvas.create_rectangle(80, 190, 170, 250, fill="white", outline="black") canvas.create_text(115, 220, text="2",font="Times 30 bold") canvas.create_rectangle(150, 50, 240, 110, fill="white", outline="black") canvas.create_text(185, 80, text="9",font="Times 30 bold") canvas.create_rectangle(150, 120, 240, 180, fill="white", outline="black") canvas.create_text(185, 150, text="6",font="Times 30 bold") canvas.create_rectangle(150, 190, 240, 250, fill="white", outline="black") canvas.create_text(185, 220, text="3",font="Times 30 bold") #SHow the = c + - x / buttons canvas.create_rectangle(80, 260, 170, 320, fill="white", outline="black") canvas.create_text(115, 290, text="=",font="Times 30 bold") canvas.create_rectangle(150, 260, 240, 320, fill="white", outline="black") canvas.create_text(185, 290, text="C",font="Times 30 bold") canvas.create_rectangle(220, 50, 370, 110, fill="white", outline="black") canvas.create_text(295, 80, text="Divide",font="Times 30 bold") canvas.create_rectangle(220, 120, 370, 180, fill="white", outline="black") canvas.create_text(295, 150, text="Times",font="Times 30 bold") canvas.create_rectangle(220, 190, 370, 250, fill="white", outline="black") canvas.create_text(295, 220, text="Minus",font="Times 30 bold") canvas.create_rectangle(220, 260, 370, 320, fill="white", outline="black") canvas.create_text(295, 290, text="Plus",font="Times 30 bold") #Make the whole calculator work canvas.create_rectangle(10, 10, 280, 40, fill="white", outline="black") global calcvalue calcvalue = 0 displayupdate() canvas.pack() window.mainloop() main() </code></pre>
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    1. COI changed clear to 'code' if pressed == "clear": calcvalue = calcvalue - int(pressed) / 10 'code' but it has a line 34, in buttonclick calcvalue = calcvalue - int(pressed) / 10 ValueError: invalid literal for int() with base 10: 'clear' error. Please help asap
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