[Tkinter] color a string of characters in tkinter

[Larz60+]

Requires python 3.6 or newer

This code will allow you to color and set background for any portion of any line

def highlight_text(tag_name, lineno, start_char, end_char, bg_color=None, fg_color=None):
    txtwidget.tag_add(tag_name, f'{lineno}.{start_char}', f'{lineno}.{end_char}')
    txtwidget.tag_config(tag_name, background=bg_color, foreground=fg_color)

And used in example:

import tkinter as tk

data = """'This is line 1.'
'This is line 2.'
'Yet another line.'
'And finally the last line.'
"""
root = tk.Tk()

txtwidget = tk.Text(root)
for line in data:
    txtwidget.insert(tk.END, line)
txtwidget.pack(expand=1, fill=tk.BOTH)

# adding a tag to a part of text specifying the indices
def highlight_text(tag_name, lineno, start_char, end_char, bg_color=None, fg_color=None):
    txtwidget.tag_add(tag_name, f'{lineno}.{start_char}', f'{lineno}.{end_char}')
    txtwidget.tag_config(tag_name, background=bg_color, foreground=fg_color)
    
highlight_text(tag_name='tag1', lineno=1, start_char=1, end_char=5, fg_color='red')
highlight_text(lineno=1, start_char=9, end_char=15, bg_color="black", fg_color='yellow', tag_name='zingo')

root.mainloop()

results:
   

** Note ** added as edit --> This can be modified to work with older versions by replacing f-string's.