How to find line number of searched string in Tkinter Textbox and then insert string just before

Question

let's say i have a tkinter Textbox like this :

textbox =

Hello world !
Life is good on earth
Winter is already there

How do i search for "good", get the line number and insert something on the line number just before ?

Expected result :

Hello world !
New sentence inserted here
Life is good on earth
Winter is already there

I know how to use the .find("good") method to get the number of characters before "good" is reached but since i want to be able to use the textbox.insert() i need the line number (not the number of characters) like 1.0 to specify where i want to insert the new sentence in the textbox .

Answer 1

You may play with the tkinter index:

from tkinter import *
 
root = Tk()
fram = Frame(root)
Label(fram,text='Text to find:').pack(side=LEFT)
edit = Entry(fram)
edit.pack(side=LEFT, fill=BOTH, expand=1)
edit.focus_set()
butt = Button(fram, text='Find') 
butt.pack(side=RIGHT)
fram.pack(side=TOP)
text = Text(root)
text.insert('1.0','''Hello world !
Life is good on earth
Winter is already there''')
text.pack(side=BOTTOM)
 
def find():
    s = edit.get()
    if s:
        idx = '1.0'
        idx = text.search(s, idx, nocase=1, stopindex=END)
        if idx:
            text.insert(idx.split('.')[0]+'.0', 'New sentence inserted here\n')
    edit.focus_set()
butt.config(command=find) 
root.mainloop()