text: I am trying to bold all of the entries for my python tkinter listbox.
  I have a list and it enters it into a listbox:
  listbox4.insert(END, Words)
  you can configure the Font used by the listbox object for all of the text
  assuming you are using python 3 and tkinter the code would be like follows (replace the import line with
  import tkFont on python 2)
  from tkinter import font listbox4.insert(END, Words) bolded = font.Font(weight='bold') # will use the default font listbox4.config(font=bolded)
  see here for some more
  tkFont documentation in case you want to change the font-family, size, etc.