clock.py

from tkinter import *
from tkinter.ttk import *

from time import strftime

root = Tk()
root.title("Clock") 

def time():
    string = strftime('%I:%M:%S %p')
    label.config(text=string)
    label.after(1000, time)

label = Label(root, font=("ds-digital",80), background = "black", foreground = "cyan")
label.pack(anchor = 'center')
time()

mainloop()