GUI TKINTER

from tkinter import *
from tkinter.messagebox import *
class MyFrame(Tk):
  def __init__(self):
    super().__init__()
    self.txt=Text(self,width=50,height=10,padx=10,pady=10)
    self.txt.pack(padx=10,pady=10)
    self.btn=Button(self,text="Show",command=self.showdata)
    self.btn.pack(fill=X,padx=10,pady=10)
    data="CCIT\nRajapeth\nAmravati"
    self.txt.insert("1.0",data)
    self.txt.insert("2.0","Gulshan Plaza\n")
  def showdata(self):
    data=self.txt.get("1.0",END)
    showinfo("DATA",data)
frm=MyFrame()
frm.mainloop()

from tkinter import *
from tkinter.filedialog import *
class MyFrame(Tk):
  def __init__(self):
    super().__init__()
    self.txt=Text(self,width=50,height=10,padx=10,pady=10)
    self.txt.pack(padx=10,pady=10)
    self.b1=Button(self,text="Open",bg="orange",command= 
    self.openfile)
    self.b1.pack(fill=X,padx=10,pady=10)
    self.b2=Button(self,text="Save",bg="cyan")
    self.b2.pack(fill=X,padx=10,pady=10)
  def openfile(self):
    lst=[("Python",".py"),("Java",".java")]
    fnm=askopenfilename(filetypes=lst)
    if fnm!="":
      f=open(fnm)
      data=f.read()
      self.txt.insert("1.0",data)
      f.close()
frm=MyFrame()
frm.mainloop()