title: How to make a section of my string a different font and size then the rest
body: <p>I am trying to make the letters ahc a bold version of courier while keeping the rest of the string the regular courier. the line of code I am talking about is in the upper_label variable.</p>
  
  <p>right now on the tkinter interface, it displays</p>
  
  <pre><code>                 A Computer Science Glossary
                              by
                              ahc
  </code></pre>
  
  <p>but i want it to say </p>
  
  <pre><code>                A Computer Science Glossary
                              by
                              AHC &lt;----- "i want that o be in bold"
  
  import tkinter as tk
  from tkinter.font import Font
  
  
  
  root = tk.Tk()
  
  HEIGHT = 700
  WIDTH=600
  #my_font=tk.Font("courie",weight="bold")
  
  
  canvas = tk.Canvas(root,height = HEIGHT, width = WIDTH)
  canvas.pack()
  
  upper_frame = tk.Frame(canvas, bg="black")
  upper_frame.place(relx=0, rely=0,relwidth=3,relheight=0.8,anchor="center")
  
  
  
  upper_label= tk.Label(upper_frame,text="A Computer Science Glossary\nby\nahc",font="courie",fg="white", bg="black")
  upper_label.place(relx=0.6,rely=0.5)
  
  lower_frame = tk.Frame(root, bg="black")
  lower_frame.place(relx=1,rely=1,relwidth=2,relheight=0.3, anchor="center")
  
  bottom_label=tk.Label(lower_frame,text="click here to exit:", fg="white", bg="black")
  bottom_label.place(relx=0,rely=0)
  
  bottom_button = tk.Button(lower_frame, text= "Exit")
  bottom_button.place(relx=0, rely=0.1,width=100)
  
  root.mainloop()
  </code></pre>