According to mypy_primer, this change has no effect on the checked open source code. 🤖🎉

Thanks. This is not quite right; it would be better to add individually all options that these functions accept and their types.

For example, like this:

def showinfo(
    title: str | None = None,
    message: str | None = None,
    *,
    detail: str = ...,
    icon: Literal["error", "info", "question", "warning"] = ...,
    parent: tkinter.Misc = ...,
) -> str: ...

To figure out what options exist, you can pass an invalid option and look at the error message. Try tkinter.messagebox.showinfo(asdf="") for example.

To figure out what each option does, you can try it, or look at the manual here: https://www.tcl-lang.org/man/tcl8.6/TkCmd/messageBox.htm

Let me know if anything is unclear. Tkinter stubs are more difficult than you'd expect :) Also, if this is more work than you want to do, you can just close this PR and wait for someone else (probably me) to do it.