modify the color a string of characters in python 3.6

[atlass218]

hello;
I look for a method python associated to objects that type is str; like the methods : upper(), lower() ...
which can help me to change the color of the character string. and the character of string is contained in a TEXT field of a database sqlite3

In addition to this field I have other fields that add to a tkinter 'Text' widget

Currently this character string is written in black and I want to change its color without integrating it into the 'Label' widget of tkinter

thanks for the help