How to get Int value from spinbox to create new entries

Question

• I created a simple spin box. what I want is, as I increase or decrease the value in spin box, a new entry should be created or deleted respectively.
• I am not able to get the Int value from the spinbox.
• I tried, user_input = int(sb.get()), But this also didn't work.
• I am getting this error, 'str' object cannot be interpreted as an integer.

,,,

1st code:

from tkinter import *
root = Tk()

sb_var = IntVar()
sb = Spinbox(root, bg='gray', textvariable=sb_var)
sb.pack()
user_input = sb.get()

for x in range(user_input):
    my_entry = Entry(root)
    my_entry.pack()

root.mainloop()

,,,

2nd code:

from tkinter import *
root = Tk()
root.geometry("500x400")


def up_or_down(direction):
    if direction == "up":
        my_entry = Entry(root)
        my_entry.pack()

    if direction == "down":         # I don't know how to code this condition
        my_entry.destroy()

tcl_up_or_down = root.register(up_or_down)

sb = Spinbox(root, from_=0, to=100, bg='gray', command=(tcl_up_or_down, '%d'))
sb.pack()

root.mainloop()

'''