Mini Project | Python+Tkinter | GUI Calculator (Complete Working Code for Students)

from tkinter import *

import tkinter.messagebox

#==========================Settings====================

root = Tk()

root.geometry('400x160')

root.title('Calculator')

color='gray60'

root.configure(bg=color)

root.resizable(width=False, height=False)

#==========================Variables===================

num1=StringVar()

num2=StringVar()

res_value=StringVar()

#==========================Frames======================

top_first=Frame(root,width=400,height=40,bg=color)

top_first.pack(side=TOP)

top_second=Frame(root,width=400,height=40,bg=color)

top_second.pack(side=TOP)

top_third=Frame(root,width=400,height=40,bg=color)

top_third.pack(side=TOP)

top_forth=Frame(root,width=400,height=40,bg=color)

top_forth.pack(side=TOP)

#==========================Functions===================

def errorMsg(ms):

     if ms=='error':

          tkinter.messagebox.showerror('Error!','Something went wrong')

     elif ms=='divisionerror':

          tkinter.messagebox.showerror('Error!',"Can't divide by 0")

          

def plus():

     try:

          value=float(num1.get())+float(num2.get())

          res_value.set(value)

     except:

          errorMsg('error')

def minus():

     try:

          value=float(num1.get())-float(num2.get())

          res_value.set(value)

     except:

          errorMsg('error')

def mul():

     try:

          value=float(num1.get())*float(num2.get())

          res_value.set(value)

     except:

          errorMsg('error')

def div():

     if num2.get()=='0':

          errorMsg('divisionerror')

     else:

          try:

               value=float(num1.get())/float(num2.get())

               res_value.set(value)

          except:

               errorMsg('error')

#==========================Buttons=====================

btn_plus=Button(top_third,text='+',width=6,

                highlightbackground=color,command=lambda : plus())

btn_plus.pack(side=LEFT,padx=5,pady=5)

btn_minus=Button(top_third,text='-',width=6,

                 highlightbackground=color,command=lambda : minus())

btn_minus.pack(side=LEFT,padx=5,pady=5)

btn_mul=Button(top_third,text='*',width=6,

               highlightbackground=color,command=lambda : mul())

btn_mul.pack(side=LEFT,padx=5,pady=5)

btn_div=Button(top_third,text='/',width=6,

               highlightbackground=color,command=lambda : div())

btn_div.pack(side=LEFT,padx=5,pady=5)

#==========================Labels+Entries==============

label_first=Label(top_first,text="Enter number-1: ",bg=color)

label_first.pack(side=LEFT,padx=5,pady=5)

first_num=Entry(top_first,highlightbackground=color,textvariable=num1)

first_num.pack(side=LEFT)

label_second=Label(top_second,text="Enter number-2: ",bg=color)

label_second.pack(side=LEFT,padx=5,pady=5)

second_num=Entry(top_second,highlightbackground=color,textvariable=num2)

second_num.pack(side=LEFT)

res=Label(top_forth,text="Result: ",bg=color)

res.pack(side=LEFT,padx=5,pady=5)

res1=Entry(top_forth,highlightbackground=color,textvariable=res_value)

res1.pack(side=LEFT)

root.mainloop()

#==========================End of Coding==============

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