Coding your own calculator using Python & Tkinter

Hello Friends,

Below is the sample code for basic calculator using Python Tkinter module.

from tkinter import *

root = Tk()

calc = 0.0
math_op = ''

root.title("Calculator")
root.geometry("200x225")
root.resizable(width=False,height=False)

def num_btn_click(value):
    global calc
    if value != 'AC':
        var = inp.get() + value
        inp.delete(0,"end")
        inp.insert(0,var)
    else:
        inp.delete(0,"end")
        calc = 0.0

def math_btn_click(value):
    global calc
    global math_op
    try:
        if value != '=':
            calc = float(inp.get())
            print("cals is",calc)
            inp.delete(0,"end")
            
        if value == '+':
            math_op = '+'
        elif value == '-':
            math_op = '-'
        elif value == '*':
            math_op = '*'
        elif value == '/':
            math_op = '/'
        elif value == '=':
            print("value1:",calc,"value2:",inp.get())
            if math_op == '+':
                ans = calc + float(inp.get())
            elif math_op == '-':
                ans = calc - float(inp.get())
            elif math_op == '*':
                ans = calc * float(inp.get())
            elif math_op == '/':
                ans = calc / float(inp.get())    
            inp.delete(0,"end")
            if math_op !='':
                inp.insert(0,str(ans))
            
    except ValueError:
        print("wrong value","calc=",calc,"mathop=",math_op)
        inp.delete(0,"end")
    
inp = Entry(width="32")
inp.grid(row=0,columnspan=4,padx=2,pady=2)
    
btn7 = Button(root,height=2,width=5,text="7",command=lambda: num_btn_click('7'))
btn7.grid(row=2,column=0,padx=2,pady=5)
btn8 = Button(root,height=2,width=5,text="8",command=lambda: num_btn_click('8'))
btn8.grid(row=2,column=1,padx=2,pady=5)
btn9 = Button(root,height=2,width=5,text="9",command=lambda: num_btn_click('9'))
btn9.grid(row=2,column=2,padx=2,pady=5)
btndiv = Button(root,height=2,width=5,text="/",command=lambda: math_btn_click('/'))
btndiv.grid(row=2,column=3,padx=2,pady=5)

btn4 = Button(root,height=2,width=5,text="4",command=lambda: num_btn_click('4'))
btn4.grid(row=3,column=0,padx=2,pady=5)
btn5 = Button(root,height=2,width=5,text="5",command=lambda: num_btn_click('5'))
btn5.grid(row=3,column=1,padx=2,pady=5)
btn6 = Button(root,height=2,width=5,text="6",command=lambda: num_btn_click('6'))
btn6.grid(row=3,column=2,padx=2,pady=5)
btnmul = Button(root,height=2,width=5,text="*",command=lambda: math_btn_click('*'))
btnmul.grid(row=3,column=3,padx=2,pady=5)

btn1 = Button(root,height=2,width=5,text="1",command=lambda: num_btn_click('1'))
btn1.grid(row=4,column=0,padx=2,pady=5)
btn2 = Button(root,height=2,width=5,text="2",command=lambda: num_btn_click('2'))
btn2.grid(row=4,column=1,padx=2,pady=5)
btn3 = Button(root,height=2,width=5,text="3",command=lambda: num_btn_click('3'))
btn3.grid(row=4,column=2,padx=2,pady=5)
btnsub = Button(root,height=2,width=5,text="-",command=lambda: math_btn_click('-'))
btnsub.grid(row=4,column=3,padx=2,pady=5)

btnAc = Button(root,height=2,width=5,text="AC",command=lambda: num_btn_click('AC'))
btnAc.grid(row=5,column=0,padx=2,pady=5)
btn0 = Button(root,height=2,width=5,text="0",command=lambda: num_btn_click('0'))
btn0.grid(row=5,column=1,padx=2,pady=5)
btnequal = Button(root,height=2,width=5,text="=",command=lambda: math_btn_click('='))
btnequal.grid(row=5,column=2,padx=2,pady=5)
btnplus = Button(root,height=2,width=5,text="+",command=lambda: math_btn_click('+'))
btnplus.grid(row=5,column=3,padx=2,pady=5)


root.mainloop()