Why isn’t .ico file defined when setting window’s icon?

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You need to have favicon.ico in the same folder or dictionary as your script because python only searches in the current dictionary or you could put in the full pathname. For example, this works:

from tkinter import *
root = Tk()

root.iconbitmap(r'c:\Python32\DLLs\py.ico')
root.mainloop()

But this blows up with your same error:

from tkinter import *
root = Tk()

root.iconbitmap('py.ico')
root.mainloop()

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