如何删除文本小部件中的最后一个字符 tkinter

Question

I am attempting to make the following code work: It is meant to delete the last character of the text widget named _textBox (as a backspace on a keyboard would usually do)...

def addChar(_textBox, char):
    global charCount
    if charCount <= 15:
        if char == "backSpace":
            _textBox.delete(charCount, END)
            if charCount != 0:
                charCount = charCount - 1
        else:
            _textBox.insert(END, char)
            charCount = charCount + 1
    print(charCount)

It seems the only problem is the '.delete()' part of the code...

Does anybody know how i can use this properly to remove only the last character in the text widget?

Thanks in advance:)

Answer 1

To delete only the last character in an entry widget You can use the following code

entryname.delete(len(entryname.get())-1,END)

Answer 2

All Good Guys!

I've followed Pat's Advice in rewriting the portion of code and it now works brilliantly! Here it is if anyone wants it:

def addChar(_textBox, char):
    global charCount, strToInsert
    if charCount == 0:
        strToInsert = ""
    if char == "backSpace":
        strToInsert = strToInsert[:-1]
        if charCount != 0:
            charCount = charCount - 1
    else:
        if charCount <= 15:
            strToInsert = strToInsert + char
            charCount = charCount + 1

    _textBox.delete("1.0", END)
    _textBox.insert(END, strToInsert)

FYI: I do set the variable charCoun in another function...

Answer 3

To delete a character, you must give the index immediately before the character you want to delete (ie: to delete the very first character you would give it "1.0" ).

The index END represents the position just after invisible newline automatically added by tkinter. "end-1" represents the position immediately before this newline. Since you want to delete the last character that the user entered (which is before this newline), you must use "end-2c" (end minus two characters).

Answer 4

I build a simple project here:

from tkinter import *
import tkinter as tk
screen=Tk()
screen.title("Test")
def reponsive():
   txt.grid()
def ins(text):
   txt.delete('1.0', END)
   txt.insert(INSERT,text)
   txt.grid()
def delete():
   text=txt.get("1.0",END)
   text=text[:-2]
   ins(text)
bt=Button(screen,command=delete,text="DEL").grid()
txt=Text(screen)
reponsive()
screen.mainloop()