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   | class MyWindow(Tk):
 
    def __init__(self):
        Tk.__init__(self)
        self.createMenuBar()
 
        self.geometry( "300x200" )
        self.title( "Mon menu" )
 
    def createMenuBar(self):
        menuBar = Menu(self)
 
        menuFile = Menu(menuBar, tearoff=0)
        menuFile.add_command(label="New", command=self.doSomething)
        menuFile.add_command(label="Open", command=self.openFile)
        menuFile.add_command(label="Save", command=self.doSomething)
        menuFile.add_separator()
        menuFile.add_command(label="Conversion en noir", command=self.doSomething1)
        menuFile.add_separator()
        menuFile.add_command(label="Exit", command=self.quit)
        menuBar.add_cascade( label="File", menu=menuFile)
 
        menuEdit = Menu(menuBar, tearoff=0)
        menuEdit.add_command(label="Undo", command=self.doSomething)
        menuEdit.add_separator()
        menuEdit.add_command(label="Copy", command=self.doSomething)
        menuEdit.add_command(label="Cut", command=self.doSomething)
        menuEdit.add_command(label="Paste", command=self.doSomething)
        menuBar.add_cascade( label="Edit", menu=menuEdit)
 
 
 
        menuHelp = Menu(menuBar, tearoff=0)
        menuHelp.add_command(label="About", command=self.doAbout)
        menuBar.add_cascade( label="Help", menu=menuHelp)
 
 
 
        self.config(menu = menuBar)        
 
    def openFile(self):
        file = askopenfilename(title="Choose the file to open", 
                filetypes=[("PNG image", ".png"), ("GIF image", ".gif"), ("All files", ".*")])
        print( file )
 
 
    def doSomething(self):
        print("Menu clicked")
 
    def doSomething1(self):
        print("Menu clicked wesh")
        Mafenetre = Tk()                
        Mafenetre.title("Image")                                  # Titre de la fenetre
        Canevas = Canvas(Mafenetre)              
 
        filename = tkinter.filedialog.askopenfilename(title="Ouvrir une image",filetypes=[('jpg files','.jpg'),('bmp files','.bmp'),('all files','.*')]) 
 
        photo = ImageTk.PhotoImage(file=filename) 
 
        def rgb2gray(rgb):
            return np.dot(rgb[...,:3], [0.299, 0.587, 0.144])
 
        img = mpimg.imread(photo)
        gray = rgb2gray(img)
        plt.imshow(gray, cmap = plt.get_cmap('gray'))
        plt.show()
 
        print (root.filename)
 
 
    def doAbout(self):
        messagebox.showinfo("My title", "My message")
 
 
window = MyWindow() | 
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