seeditsolution · kunz98 · Oct 15, 2020
diff --git a/guicalculator b/guicalculator
@@ -0,0 +1,110 @@
+ from tkinter import *
+
+# globally declare the expression variable 
+expression = "" 
+
+
+# Function to update expressiom 
+# in the text entry box 
+def press(num):
+    global expression 
+    expression = expression + str(num) 
+    equation.set(expression) 
+
+
+# Function to evaluate the final expression 
+def equalpress():
+    try: 
+        global expression 
+        total = str(eval(expression)) 
+        equation.set(total) 
+        expression = "" 
+
+    except: 
+        equation.set(" error ")
+        expression = "" 
+
+
+
+def clear(): 
+    global expression 
+    expression = "" 
+    equation.set("") 
+
+
+
+
+
+if __name__ == "__main__": 
+    # create a GUI window 
+    gui = Tk() 
+
+    # set the background colour of GUI window 
+    gui.configure(background="light green") 
+
+
+    gui.title("Simple Calculator") 
+
+    gui.geometry("265x265") 
+
+    # StringVar() is the variable class 
+    # we create an instance of this class 
+    equation = StringVar() 
+
+    # create the text entry box for 
+    # showing the expression . 
+    expression_field = Entry(gui, textvariable=equation)  
+    expression_field.grid(columnspan=4, ipadx=70) 
+
+    equation.set('enter your expression') 
+
+    button1 = Button(gui, text=' 1 ',fg='black',bg='red',command=lambda: press(1)) 
+    button1.grid(row=2, column=0) 
+
+    button2 = Button(gui, text=' 2 ',fg='black',bg='red',command=lambda: press(2)) 
+    button2.grid(row=2, column=1) 
+
+    button3 = Button(gui, text=' 3 ',fg='black',bg='red',command=lambda: press(3)) 
+    button3.grid(row=2, column=2) 
+
+    button4 = Button(gui, text=' 4 ',fg='black',bg='red',command=lambda: press(4)) 
+    button4.grid(row=3, column=0) 
+
+    button5 = Button(gui, text=' 5 ',fg='black',bg='red',command=lambda: press(5)) 
+    button5.grid(row=3, column=1) 
+
+    button6 = Button(gui, text=' 6 ',fg='black',bg='red',command=lambda: press(6)) 
+    button6.grid(row=3, column=2) 
+
+    button7 = Button(gui, text=' 7 ',fg='black',bg='red',command=lambda: press(7)) 
+    button7.grid(row=4, column=0) 
+
+    button8 = Button(gui, text=' 8 ',fg='black',bg='red',command=lambda: press(8)) 
+    button8.grid(row=4, column=1) 
+
+    button9 = Button(gui, text=' 9 ',fg='black',bg='red',command=lambda: press(9)) 
+    button9.grid(row=4, column=2) 
+
+    button0 = Button(gui, text=' 0 ',fg='black',bg='red',command=lambda: press(0)) 
+    button0.grid(row=5, column=0) 
+
+    plus = Button(gui, text=' + ',fg='black',bg='red',command=lambda: press("+")) 
+    plus.grid(row=2, column=3) 
+
+    minus = Button(gui, text=' - ',fg='black',bg='red',command=lambda: press("-")) 
+    minus.grid(row=3, column=3) 
+
+    multiply = Button(gui, text=' * ',fg='black',bg='red',command=lambda: press("*")) 
+    multiply.grid(row=4, column=3) 
+
+    divide = Button(gui, text=' / ',fg='black',bg='red',command=lambda: press("/")) 
+    divide.grid(row=5, column=3) 
+
+    equal = Button(gui, text=' = ', fg='black',bg='red',command=equalpress) 
+    equal.grid(row=5, column=2) 
+
+    clear = Button(gui, text='Clear', fg='black', bg='red',command=clear) 
+    clear.grid(row=5, column='1') 
+
+    # start the GUI 
+    gui.mainloop()