I learned how to make a "Desktop Launcher"

I right clicked on my desktop and created a desktop launcher for my gas mileage program.  The code is pasted below.


#!/usr/bin/python
#Gas mileage calculator written in version 2.6
#This program helps me keep track of my gas mileage!

from Tkinter import *

def calcMPG():
    theGallons = galEntry.get()
    theMiles = milesEntry.get()
    milesPerGallon = float(theGallons)/float(theMiles),'miles per gallon'
    print milesPerGallon
#open a file and write to it.
    fob = open('Aveo_MPG.txt','a')
    fob.write('------------------------------')
    fob.write('\n')
    fob.write(str(theGallons)+galEntry.get()+'\n')
    fob.write('Miles = '+milesEntry.get()+'\n')
    fob.write(str(milesPerGallon)+'\n')
    fob.close
#Clear the entry widgets!
    galEntry.delete(0,END)
    milesEntry.delete(0,END)
#open Aveo_MPG file and list it. THIS WORKS GREAT!
def show():
    fob = open('Aveo_MPG.txt','r')
    for eachline in fob:
        print eachline
    fob.close()
  
          
root = Tk()
root.config(bg='blue')

aLable = Label(root,text="Miles")
aLable.pack()

galEntry = Entry(root)
galEntry.pack(padx=5,pady=5)

aLable2=Label(root,text="Gallons")
aLable2.pack()

milesEntry=Entry(root)
milesEntry.pack(padx=5,pady=5)

btn1= Button(root,text='Calc MPG', command = calcMPG)
btn1.pack(padx=5,pady=5)

btn2=Button(root,text='Show list',command=show)
btn2.pack(padx=5,pady=5)
root.mainloop()