Как в Tkinter узнать позицию курсора и выделенный текст в виджете Entry?

Есть текстовые индексы Entry, соответствующие, например, позиции курсора и начала/конца выделения:

INDICES

Many of the widget commands for entries take one or more indices as arguments. An index specifies a particular character in the entry's string, in any of the following ways:

• number - Specifies the character as a numerical index, where 0 corresponds to the first character in the string.

• "anchor" - Indicates the anchor point for the selection, which is set with the select_from() and select_adjust() widget methods.

• "end" - Indicates the character just after the last one in the entry's string. This is equivalent to specifying a numerical index equal to the length of the entry's string.

• "insert" - Indicates the character adjacent to and immediately following the insertion cursor.

• "sel.first" - Indicates the first character in the selection. It is an error to use this form if the selection is not in the entry window.

• "sel.last" - Indicates the character just after the last one in the selection. It is an error to use this form if the selection is not in the entry window.

• @number - In this form, number is treated as an x-coordinate in the entry's window; the character spanning that x-coordinate is used. For example, "@0" indicates the left-most character in the window.

По информации отсюда: tkinter.Entry

Эти индексы можно использовать в некоторых методах Entry, вот пример для вставки текста в позиции курсора: entry.insert("insert", "Some text").

Для получения числовых значений этих индексов можно использовать метод .index().

Полный пример с выводом позиции курсора, начала/конца выделения и выделенного текста:

from tkinter import *

root = Tk()

entry = Entry()
entry.pack()


def command():
    print("Cursor positon:", entry.index("insert"))
    if entry.selection_present():
        selection_from = entry.index("sel.first")
        selection_to = entry.index("sel.last")
        print(f"Selection from {selection_from} to {selection_to}")
        print("Selected text:", entry.get()[selection_from:selection_to])


button = Button(text="Press me", command=command)
button.pack()

root.mainloop()