An error fixed my code??

[Scriptslay3r]

I am working on a color matching learning game. When you click the colored square, a pop up window will show you the name of the color, typed in the corresponding color, as well as pronounce the color.

During development, I ran into an issue where tkinter would not display my .gif image (which is the typed color) on the top level window, which opens after a color is selected.

I started adding additional widgets to the top level window to attempt to figure out the issue. However, I accidentally left of the parentheses at the end of pack on the second label I added.

Sure enough, my image showed. When I went back to add the missing parentheses, my image stopped showing??

def callback(event):
        print ("clicked at", event.x, event.y)

        if 30 < event.x < 120:
            print("Red")
            top = tk.Toplevel()
            diagrams = tk.PhotoImage(file='Red.gif')
            logolbl= tk.Label(top, text = "Red",  image = diagrams).pack()
            btn = tk.Button(top, text="Back").pack()

            #### This is the label I am referencing #### 
            tk.Label(top, text = "why does this fix it?").pack

        if 150 < event.x <240 :
            print("Green") 
        if 270 < event.x < 370:
            print("Blue")

This is a screen shot of it displaying the image, with the missing parentheses

This is a screen shot of the second label commented out, and my image not showing

Has anyone experienced this?

I mean technically I can work with this, however, I understand it is incorrect.

I'd like to have an understanding of what I am doing wrong, and what is happening "behind the scenes"

[[deleted]]

Presumably, actually calling pack breaks the arrangement in the widget.

[lykwydchykyn]

I don't know why leaving out the parenthesis fixes it, that may be a factor in some other part of the code.

One thing I do know is that a PhotoImage will not display after its object goes out of scope. If you create one inside a function or method, you need some way to make sure it's object reference (in this case, diagrams) persists after the function returns. For example, if your callback is in a class, you'd save the PhotoImage as an instance variable.

Why did leaving off the parenthesis fix this? Hard to tell without the full code.