Small UI development Program using Python

Small UI development Program using Python :

When a new person joined in a project, The person needs basic information regarding the project.
__author__ = "Narendra Boyina"

# Python version 3.5.2
import os
from tkinter import *
#from docx import *
w = Tk()
w.title("Laird project")
w.geometry("600x600+200+100")
n = 'Times New Roman',12,'italic'

def Ofileopen():
    os.system("notepad {0}".format(r'D:\waste\Fleet STEL.txt'))
    #give the path where the file is located (raw input)
def Ffileopen():
    os.system("notepad {0}".format(r'D:\waste\Fleet STEL.txt'))
def Tfileopen():
    os.system("notepad {0}".format(r'D:\waste\TR100STEL.txt'))
def Afileopen():
    os.system("notepad {0}".format(r'D:\waste\TR100STEL.txt'))
##    f = open('D:\\waste\\TR100STEL.txt','r')
##    Label(text=f.read(),font=(n)).pack()

def mmm():
    a= v.get()
    if(a == 1):
        a1=Tk()
        a1.title("Orion")
        Label(a1,text='Wlcome to Orion device').pack()
        button = Button(a1,text='Open File',width=30, command =Ofileopen).pack()
    elif(a == 2):
        a2=Tk()
        a2.title("Fleet")
        button = Button(a2,text='Open File',width=30, command =Ffileopen).pack()
    elif(a == 3):
        a3=Tk()
        a3.title("TR100")
        Label(a3,text='Wlcome to TR100 device').pack()
        button = Button(a3,text='Open STEL File',width=30, command =Tfileopen).pack()
        button = Button(a3,text='Open API File',width=30, command =Afileopen).pack()
mymenu = Menu()# object  created to holds horizontal list

listone = Menu()    #This  object is for holding list of File commands(New File, Open Save Exit)
listone.add_command(label='Overview of the Project')
##listone.add_command(label='Open File')
##listone.add_command(label='Save File')
##listone.add_command(label='Exit')

listtwo =  Menu()  # This object is for holding list of  project members
listtwo.add_command(label='Ravi Naga kumar')
listtwo.add_command(label='Kumar Akshat')
listtwo.add_command(label='Sivaram Prasad')
listtwo.add_command(label='Vidya Sagar')
listtwo.add_command(label='Narendra')

listthree = Menu() # This object is for holding list of Softwares & software tools
listthree.add_command(label='Renesas_Flash_Programmer')
listthree.add_command(label='FleetBootMonitor')
listthree.add_command(label='--------------')
listthree.add_command(label='DevSuite')
listthree.add_command(label='Bugzilla')

listfour =  Menu()  # This object is for holding list of  Hardware Tools
listfour.add_command(label='Gryphon Simulator')
listfour.add_command(label='RFchamber')
listfour.add_command(label='Lab Sat Simulator')
listfour.add_command(label='RPS')

listfive =  Menu()  # This object is for holding list of  contact info
listfive.add_command(label='Ravi-9945324200')
listfive.add_command(label='Siva-9951421342')
listfive.add_command(label='Akshat-9722525280')
listfive.add_command(label='Sagar-9448547552')
listfive.add_command(label='Narendra-9700422902')

mymenu.add_cascade(label="Home",menu=listone,)
mymenu.add_cascade(label="Project members",menu=listtwo)
mymenu.add_cascade(label="Softwares & S/W Tools",menu=listthree)
mymenu.add_cascade(label="H/W Tools",menu=listfour)
mymenu.add_cascade(label="Contact info",menu=listfive)
mymenu.add_cascade(label="Help")
w.config(menu =mymenu) # myGui  object is the window(  We are adding/ configuring menu items)
v=IntVar()
v.set(2)

Devices = [("Orion",1),("Fleet",2),("TR100",3)]
Label(w,text='Choose the device for STEL Document',padx=20).pack(anchor=W)
for txt,val in Devices:
             Radiobutton(w,text=txt,padx=40,indicatoron=0,variable=v,command=mmm,value=val).pack(anchor=W)
w.mainloop()