python copy and paste formatted string for word or onenote

Question

I have a paragraph and want to bold specific words in it, copy to clipboard for pasting into onenote. I can not figure out how to get the bold formatting to work. Here's what I have so far.

LL=L.split("****")
newlist = []
for line in LL: 
    newline = ""
    if line.strip().isnumeric():
        newline = newline + '<b>' + line + '</b>'
    if any(string in line for string in boldstrings):
        for string in line.split(" "):
            if any(word in string for word in boldstrings):
                newline = newline + '<b>' + string + '</b>' + " "
            else:
                newline = newline + string + " "
    newline = newline + "\n"
    print(newline)
    newlist.append(newline)
    
r = Tk()
r.withdraw()
r.clipboard_clear()
r.clipboard_append(' '.join(newlist))
r.update() # now it stays on the clipboard after the window is closed
r.destroy()