Bug report

Bug description:

importtkinterfromtkinterimportmessageboxroot=tkinter.Tk()root.update()root.tk.call("wm","iconbitmap",root._w,"-default","")messagebox.showinfo()root.mainloop()

Running the code above can get the following effect:

importtkinterfromtkinterimportmessageboxroot=tkinter.Tk()root.update()root.wm_iconbitmap(default="")# the different linemessagebox.showinfo()root.mainloop()

Running the code above can get the following effect:

However, in fact, these two pieces of code should be equivalent, but due to an inaccurate logical judgment, this problem arises.

This is a very easy bug to fix, and I'll create a PR to fix it later.

The issue may only exist on Windows systems.

CPython versions tested on:

3.13

Operating systems tested on:

Windows

Linked PRs

• gh-128014: fix handling of adefault empty string passed totkinter.Wm.wm_iconbitmap #128015
• [3.13] gh-128014: Fix passing default='' to the tkinter method wm_iconbitmap() (GH-128015) #128418
• [3.12] gh-128014: Fix passing default='' to the tkinter method wm_iconbitmap() (GH-128015) #128420