PNG won't show in pop up window Tkinter

Question

My PNG file won't show up in my pop up window, despite the variable for my img being global.

global img

def Malwind():
    maltop = Toplevel()
    maltop.iconbitmap('icon.ico')
    maltop.title("Expert Systems Diagnosis Results")
    mgt1 = Label(maltop, text="The breast lump is diagnosed to be: Malignant").grid(row=5, column=2)
    mgt2 = Label(maltop, text="The following symptoms could be observed").grid(row=6, column=2)
    mgt3 = Label(maltop, text="Skin irritation\nPain or tenderness of the nipple\nBloody nipple discharge").grid(row=7, column=2)
    canvas = Canvas(maltop, width = 200, height = 200)
    canvas.grid(row = 1, column = 2)
    img = ImageTk.PhotoImage(Image.open("soft.png"))
    canvas.create_image(0, 0, anchor = NW, image = img)

You need to move `global img` into the function. – acw1668 Jan 10 '21 at 13:12 — acw1668, Jan 10 '21 at 13:12

DapperDuck · Accepted Answer · 2021-01-11T15:08:41.607

The Global keyword is supposed to be within a function and allows the function to modify a variable in the global scope within a function. This means that you have to move global img into the function, and make sure that this variable already exists in the global scope. Here is the corrected code:

def Malwind():
    global img
    maltop = Toplevel()
    maltop.iconbitmap('icon.ico')
    maltop.title("Expert Systems Diagnosis Results")
    mgt1 = Label(maltop, text="The breast lump is diagnosed to be: Malignant").grid(row=5, column=2)
    mgt2 = Label(maltop, text="The following symptoms could be observed").grid(row=6, column=2)
    mgt3 = Label(maltop, text="Skin irritation\nPain or tenderness of the nipple\nBloody nipple discharge").grid(row=7, column=2)
    canvas = Canvas(maltop, width = 200, height = 200)
    canvas.grid(row = 1, column = 2)
    img = ImageTk.PhotoImage(Image.open("soft.png"))
    canvas.create_image(0, 0, anchor = NW, image = img)

PNG won't show in pop up window Tkinter

1 Answers1