Calculator using Python | Tkinter| with source code

Calculator|Python|

Tkinter is a Python binding to the Tk GUI toolkit. It is the standard Python interface to the Tk GUI toolkit.The name Tkinter comes from Tk interface.In this code of calculato we use the pack() method of tkinter to set the buttons in the rows.

Implementation:

#Step1:importing required library
from tkinter import *
from tkinter import messagebox

#Step2:creating globalvariables
val=""
A = 0
operator =""

#Step3:Creating functions of all buttons
def btn1Click():
global val
val= val +"1"
data.set(val) #set the value of val
def btn2Click():
global val
val= val +"2"
data.set(val)
def btn3Click():
global val
val =val +"3"
data.set(val)
def btn4Click():
global val
val= val+ "4"
data.set(val)
def btn5Click():
global val
val= val+ "5"
data.set(val)
def btn6Click():
global val
val= val+ "6"
data.set(val)
def btn7Click():
global val
val= val+ "7"
data.set(val)
def btn8Click():
global val
val= val+ "8"
data.set(val)
def btn9Click():
global val
val= val+ "9"
data.set(val)
def btn0Click():
global val
val= val+ "0"
data.set(val)



#Step4:function for setting operators
#Addition
def btnP():
global val
global  A
global operator
A = int(val)
operator="+"
val=val + "+"
data.set(val)

#Substraction
def btnS():
global val
global A
global operator
A=int(val)
operator="-"
val=val+"-"
data.set(val)

# Multiplication
def btnM():
global val
global A
global operator
A=int(val)
operator="*"
val=val+"*"
data.set(val)

#modules
def btnMo():
global val
global A
global operator
A=int(val)
operator="%"
val=val+"%"
data.set(val)

#Division
def btnD():
global val
global A
global operator
A=int(val)
operator="/"
val=val+"/"
data.set(val)
 
#clearing the value 
def Clear():
global A
global operator
global val
val =""
A = 0
operator=""
data.set(val)

#Step5:Functions for calculation
def result():
global A
global operator
global val
val2 =val
if operator=="+":
x=int((val2.split("+")[1]))
c=A+x
data.set(c)
val=str(c)
elif operator=="-":
x=int((val2.split("-")[1]))
c=A-x
data.set(c)
val=str(c)
elif operator=="*":
x=int((val2.split("*")[1]))
c=A*x
data.set(c)
val=str(c)

elif operator=="/":
x = int((val2.split("/")[1]))
if x ==0:
messagebox.showerror("Error","Division by 0not supported")
A=""
val=""
data.set(val)
else:
c = int(A / x)
data.set(c)
val = str(c)

elif operator=="%":
x = int((val2.split("%")[1]))
if x ==0:
messagebox.showerror("Error","Division by 0 not supported")
A=""
val=""
data.set(val)
else:
c = int(A % x)
data.set(c)
val = str(c)

#Step6:creating root object
root=Tk()
root.geometry("230x300+100+200")
root.resizable(0,0)

data=StringVar()

lbl=Label(root,textvariable=data,background="powderblue",
  text="",anchor=SE,font="20").pack(expand=True,fill="both")

#Step7:Creating rows for buttons
btnrow1=Frame(root)
btnrow1.pack(expand= True,fill="both")
btnrow2=Frame(root)
btnrow2.pack(expand= True,fill="both")
btnrow3=Frame(root)
btnrow3.pack(expand= True,fill="both")
btnrow4=Frame(root)
btnrow4.pack(expand= True,fill="both")

#Step8:Setting button position and text
btn1=Button(btnrow1,text="1",command=btn1Click)
btn1.pack(side=LEFT,expand="True",fill="both")
btn2=Button(btnrow1,text="2",command=btn2Click)
btn2.pack(side=LEFT,expand="True",fill="both")
btn3=Button(btnrow1,text="3",command=btn3Click)
btn3.pack(side=LEFT,expand="True",fill="both")
btnplus=Button(btnrow1,text="+",command=btnP)
btnplus.pack(side=LEFT,expand="True",fill="both")

btn4=Button(btnrow2,text="4",command=btn4Click)
btn4.pack(side=LEFT,expand="True",fill="both")
btn5=Button(btnrow2,text="5",command=btn5Click)
btn5.pack(side=LEFT,expand="True",fill="both")
btn6=Button(btnrow2,text="6",command=btn6Click)
btn6.pack(side=LEFT,expand="True",fill="both")
btnsub=Button(btnrow2,text="-",command=btnS)
btnsub.pack(side=LEFT,expand="True",fill="both")

btn7=Button(btnrow3,text="7",command=btn7Click)
btn7.pack(side=LEFT,expand="True",fill="both")
btn8=Button(btnrow3,text="8",command=btn8Click)
btn8.pack(side=LEFT,expand="True",fill="both")
btn9=Button(btnrow3,text="9",command=btn9Click)
btn9.pack(side=LEFT,expand="True",fill="both")
btnmul=Button(btnrow3,text="*",command=btnM)
btnmul.pack(side=LEFT,expand="True",fill="both")

btn0=Button(btnrow4,text="0",command=btn0Click)
btn0.pack(side=LEFT,expand="True",fill="both")
btneql=Button(btnrow4,text="=",command=result)
btneql.pack(side=LEFT,expand="True",fill="both")
btnmod=Button(btnrow4,text="%",command=btnMo)
btnmod.pack(side=LEFT,expand="True",fill="both")
btndiv=Button(btnrow4,text="/",command=btnD)
btndiv.pack(side=LEFT,expand="True",fill="both")
btnc=Button(root,text="C",command=Clear)
btnc.pack(side=BOTTOM,expand="True",fill="both")

#Step9:keeps window alive 
root.mainloop()

Output:

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