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import tkinter as tk

root = tk.Tk() # Main box window

root.title("Standard Calculator") # Title shown at the title bar

root.resizable(0, 0) # disabling the resizeing of the window

# Creating an entry field:

e = tk.Entry(root,

width=35,

bg='#f0ffff',

fg='black',

borderwidth=5,

justify='right',

font='Calibri 15')

e.grid(row=0, column=0, columnspan=3, padx=12, pady=12)

def buttonClick(num): # function for clicking

temp = e.get(

) # temporary varibale to store the current input in the screen

e.delete(0, tk.END) # clearing the screen from index 0 to END

e.insert(0, temp + num) # inserting the incoming number input

def buttonClear(): # function for clearing

e.delete(0, tk.END)

def buttonGet(

oper

): # function for storing the first input and printing '+, -, /, *'

global num1, math # global variable num1 and math to use in function buttonEqual()

num1 = e.get() # getting first number

math = oper # oper varaible is the type of operation being performed

e.insert(tk.END, math)

try:

num1 = float(num1) # converting the number to float type

except ValueError: # in case there is a character other than numerals, clear the screen

buttonClear()

def buttonEqual(): # function for printing the sum

inp = e.get() # getting the inserted input

num2 = float(inp[inp.index(math) + 1:]) # getting the second number

e.delete(0, tk.END)

if math == '+': # Addition

e.insert(0, str(num1 + num2))

elif math == '-': # Subtraction

e.insert(0, str(num1 - num2))

elif math == 'x': # Multiplication

e.insert(0, str(num1 * num2))

elif math == '/': # Division

try:

e.insert(0, str(num1 / num2))

except ZeroDivisionError:

# in case there is a zero in the denominator, answer is undefined

e.insert(0, 'Undefined')

# Defining Buttons:

b1 = tk.Button(root,

text='1',

padx=40,

pady=10,

command=lambda: buttonClick('1'),

font='Calibri 12')

b2 = tk.Button(root,

text='2',

padx=40,

pady=10,

command=lambda: buttonClick('2'),

font='Calibri 12')

b3 = tk.Button(root,

text='3',

padx=40,

pady=10,

command=lambda: buttonClick('3'),

font='Calibri 12')

b4 = tk.Button(root,

text='4',

padx=40,

pady=10,

command=lambda: buttonClick('4'),

font='Calibri 12')

b5 = tk.Button(root,

text='5',

padx=40,

pady=10,

command=lambda: buttonClick('5'),

font='Calibri 12')

b6 = tk.Button(root,

text='6',

padx=40,

pady=10,

command=lambda: buttonClick('6'),

font='Calibri 12')

b7 = tk.Button(root,

text='7',

padx=40,

pady=10,

command=lambda: buttonClick('7'),

font='Calibri 12')

b8 = tk.Button(root,

text='8',

padx=40,

pady=10,

command=lambda: buttonClick('8'),

font='Calibri 12')

b9 = tk.Button(root,

text='9',

padx=40,

pady=10,

command=lambda: buttonClick('9'),

font='Calibri 12')

b0 = tk.Button(root,

text='0',

padx=40,

pady=10,

command=lambda: buttonClick('0'),

font='Calibri 12')

bdot = tk.Button(root,

text='.',

padx=41,

pady=10,

command=lambda: buttonClick('.'),

font='Calibri 12')

badd = tk.Button(root,

text='+',

padx=29,

pady=10,

command=lambda: buttonGet('+'),

font='Calibri 12')

bsub = tk.Button(root,

text='-',

padx=30,

pady=10,

command=lambda: buttonGet('-'),

font='Calibri 12')

bmul = tk.Button(root,

text='x',

padx=30,

pady=10,

command=lambda: buttonGet('x'),

font='Calibri 12')

bdiv = tk.Button(root,

text='/',

padx=30.5,

pady=10,

command=lambda: buttonGet('/'),

font='Calibri 12')

bclear = tk.Button(root,

text='AC',

padx=20,

pady=10,

command=buttonClear,

font='Calibri 12')

bequal = tk.Button(root,

text='=',

padx=39,

pady=10,

command=buttonEqual,

font='Calibri 12')

# Putting the buttons on the screen:

b1.grid(row=3, column=0)

b2.grid(row=3, column=1)

b3.grid(row=3, column=2)

badd.grid(row=3, column=3)

b4.grid(row=2, column=0)

b5.grid(row=2, column=1)

b6.grid(row=2, column=2)

bmul.grid(row=2, column=3)

b7.grid(row=1, column=0)

b8.grid(row=1, column=1)

b9.grid(row=1, column=2)

bdiv.grid(row=1, column=3)

b0.grid(row=4, column=0)

bdot.grid(row=4, column=1)

bequal.grid(row=4, column=2)

bsub.grid(row=4, column=3)

bclear.grid(row=0, column=3)

# Looping the window:

root.mainloop()