Python tkinter question

I would like to send a text to clipboard. Please advise

import tkinter as tk
from tkinter import ttk
from tkinter.messagebox import showinfo

# root window
root = tk.Tk()
root.geometry('300x220')
root.resizable(False, False)
root.title('High Sev Template')


def show_selected_size():
    showinfo(
        title='Result',
        message=selected_size.get()
    )


selected_size = tk.StringVar()
sizes = (('Template1', '1'),
         ('Template2', '2'),
         ('Template3', '3'),
         ('Template4', '4'),
         ('Template5', '5'))

# label
label = ttk.Label(text="High Sev Template")
label.pack(fill='x', padx=5, pady=5)

# radio buttons
for size in sizes:
    r = ttk.Radiobutton(
        root,
        text=size[0],
        value=size[1],
        variable=selected_size
    )
    r.pack(fill='x', padx=5, pady=5)

# button
button = ttk.Button(
    root,
    text="Send to Clipboard",
    command=show_selected_size)

button.pack(fill='x', padx=5, pady=5)


root.mainloop()

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