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
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