from tkinter import *
from tkinter import filedialog
import tkinter as tk
from PIL import Image,ImageTk
import os

def showimage():
    filename=filedialog.askopenfilename(initialdir=os.getcwd(),title="Select image file",filetype=(("JPG File","*.jpg"),("PNG file","*.png"),("All file ","how are you .txt")))
    img=Image.open(filename)
    img=ImageTk.PhotoImage(img)
    lbl.configure(image=img)
    lbl.image=img

root=Tk()

fram=Frame(root)
fram.pack(side=BOTTOM,padx=15,pady=15)

lbl=Label(root)
lbl.pack()

btn=Button(fram,text="Select Image",command=showimage)
btn.pack(side=tk.LEFT)

btn2=Button(fram,text="Exit",command=lambda:exit())
btn2.pack(side=tk.LEFT,padx=12)

root.title("image Viewer")
root.geometry("400x450")
root.mainloop()