tkinter slider that changes font size dynamically

tk_scale_widget.py

from tkinter import *
from tkinter import ttk

master = Tk()
master.geometry('750x350+200+200')

scale_1 = ttk.Scale(master, orient='horizontal', length=200, from_=10, to=30)
scale_1.pack(padx=10, pady=30, anchor='nw')

label_1 = ttk.Label(master, text='Hello World', background='orange', font=('Candara', 10, 'italic'))
label_1.pack(padx=10, pady=10, fill='both', expand=True)

def fontSize():
    label_1.config(font=('Candara', int(scale_1.get())))

scale_1.config(command=lambda e: fontSize())

master.mainloop()