What is the trick between these?

[MRAB]

On 2016-08-15 19:41, huey.y.jiang at gmail.com wrote:
> Hi All,
>
>
> I am trapped by these two funny things:
>
> class MyClass(upClass):
>
>    def start(self):
>        ***do_menu_here****
>
>        self.load_label_image()  # ---> this works
>        self.load_canvas_image()  # ---> this does not work
>
>    def load_label_image(self):
>        img = PhotoImage(file="xx.gif")
>        Label(self, image=img).pack(side=BOTTOM, expand=YES, fill=BOTH)
>        return img
>
>    def load_canvas_image(self):
>        img = PhotoImage(file="xx.gif")
>        self.canvas = Canvas(self, width=500, height=300, bg='white')
>        self.canvas.pack(expand=YES, fill=BOTH)
>        self.canvas.create_image(50, 0, image=img, anchor=NW)
>
> if __name__ == '__main__':
>         root = Tk()
>         root.mainloop()
>
> load_label_image() works. However, I cannot do BIND with it, because img has no method to do binding. So, I am trying load_canvas_image. Surprise, it does not work. These two defs are so similar, but Python complained that no attribute of load_canvas_image(). It is there, coexisting with load_label_image().
>
> I cannot figure out what is wrong with it, can somebody tell me why? Thanks!
>
If you can't bind to the image itself, then bind to the label you put it 
in instead.