Загрузка изображения в Canvas

from tkinter import*
from tkinter.filedialog import*
import Image, ImageTk
 
def _open():
    a=askopenfilename()
    b=ImageTk.PhotoImage(a)
    rus.Create_Image(0, 0, image=b, anchor="nw")
    
root=Tk(className="Form")
but1=Button(root, text="Open", command=_open)
rus=Canvas(root, width=300, height=300, bg="white")
 
rus.pack()
but1.pack()
root.mainloop()

import tkinter
from tkinter.filedialog import askopenfilename
from PIL import Image, ImageTk
 
 
class MainWindow():
    def __init__(self):
        self.view = None
        self.choose = None
        self.image = None
 
        self.build_widgets()
 
    def build_widgets(self):
        self.view = tkinter.Canvas(root, width=300, height=300, bg="white")
        self.view.pack()
 
        choose = tkinter.Button(root, text="Open", command=self.choose_file)
        choose.pack()
 
    def choose_file(self):
        path = askopenfilename()
        self.image = ImageTk.PhotoImage(Image.open(path))
        self.view.create_image(0, 0, image=self.image, anchor="nw")
 
 
root = tkinter.Tk()
window = MainWindow()
root.mainloop()