from tkinter import * root = Tk() root.title("Calculator") # So that it becomes of fixed size root.resizable(0, 0) # So that it remains on top of the screen root.wm_attributes("-topmost", 1) # Label Label1 = Label(root, text = "Calculator app") Label1.grid(row=0, columnspan=8) # Variables equa = "" equation = StringVar() calculation = Label(root, textvariable = equation) equation.set("Enter your expression : ") calculation.grid(row=2, columnspan=8) def btnPress(num): global equa equa = equa + str(num) equation.set(equa) def EqualPress(): global equa total = str(eval(equa)) equation.set(total) equa = "" def ClearPress(): global equa equa = "" equation.set("") Button0 = Button(root, text="0", command = lambda:btnPress(0), borderwidth=1, relief=SOLID) Button0.grid(row = 6, column = 2, padx=10, pady=10) Button1 = Button(root, text="1", command = lambda:btnPress(1), borderwidth=1, relief=SOLID) Button1.grid(row = 3, column = 1, padx=10, pady=10) Button2 = Button(root, text="2", command = lambda:btnPress(2), borderwidth=1, relief=SOLID) Button2.grid(row = 3, column = 2, padx=10, pady=10) Button3 = Button(root, text="3", command = lambda:btnPress(3), borderwidth=1, relief=SOLID) Button3.grid(row = 3, column = 3, padx=10, pady=10) Button4 = Button(root, text="4", command = lambda:btnPress(4), borderwidth=1, relief=SOLID) Button4.grid(row = 4, column = 1, padx=10, pady=10) Button5 = Button(root, text="5", command = lambda:btnPress(5), borderwidth=1, relief=SOLID) Button5.grid(row = 4, column = 2, padx=10, pady=10) Button6 = Button(root, text="6", command = lambda:btnPress(6), borderwidth=1, relief=SOLID) Button6.grid(row = 4, column = 3, padx=10, pady=10) Button7 = Button(root, text="7", command = lambda:btnPress(7), borderwidth=1, relief=SOLID) Button7.grid(row = 5, column = 1, padx=10, pady=10) Button8 = Button(root, text="8", command = lambda:btnPress(8), borderwidth=1, relief=SOLID) Button8.grid(row = 5, column = 2, padx=10, pady=10) Button9 = Button(root, text="9", command = lambda:btnPress(9), borderwidth=1, relief=SOLID) Button9.grid(row = 5, column = 3, padx=10, pady=10) Plus = Button(root, text="+", command = lambda:btnPress("+"), borderwidth=1, relief=SOLID) Plus.grid(row = 3, column = 4, padx=10, pady=10) Minus = Button(root, text="-", command = lambda:btnPress("-"), borderwidth=1, relief=SOLID) Minus.grid(row = 4, column = 4, padx=10, pady=10) Multiply = Button(root, text="*", command = lambda:btnPress("*"), borderwidth=1, relief=SOLID) Multiply.grid(row = 5, column = 4, padx=10, pady=10) Divide = Button(root, text="/", command = lambda:btnPress("/"), borderwidth=1, relief=SOLID) Divide.grid(row = 6, column = 4, padx=10, pady=10) Equal = Button(root, text="=", command = EqualPress, borderwidth=1, relief=SOLID) Equal.grid(row=6, column=3, padx=10, pady=10) Clear = Button(root, text="C", command = ClearPress, borderwidth=1, relief=SOLID) Clear.grid(row = 6, column = 1, padx=10, pady=10) root.mainloop()

**Note**:

Tkinter module comes with Python as no need to install by using third party tool,

if not fallow the below link for installing on respected platforms.

http://www.tkdocs.com/tutorial/install.html

**Source link**

http://codeshot.in/pythongui/calculator.php

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