Tkinter combobox reload value

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Python3.6

Hey, In my tkinter program i want to create a combobox and based on 1st combobox input 2nd combo box value will display. I think to do this I need to in reload combobox I don't have any idea how to do that. Can you please help me

Below my code

What I have tried:

import tkinter
import os
from tkinter import ttk
from tkinter import *
from data.binding import *
frame3=Tk()


Label(frame3,text="Shop Name").place(x=100,y=50)
shop_name=[]
pn=[]
addd=[]
myVar=StringVar()
if os.path.isfile("C:\\Dragon\dealer.txt"):
    with open ("C:\\Dragon\dealer.txt") as sn:
        for line in sn:
            if line.split(";")[0] not in shop_name:
                shop_name.append(line.split(';')[0].strip())
shopauto=ttk.Combobox(frame3,values=shop_name,width=30)
shopauto.bind("<<ComboboxSelected>>",select(pn,addd,myVar))
shopauto.place(x=230,y=50)
Label(frame3,text="Proprietor Name").place(x=100,y=90)
proname=ttk.Combobox(frame3,values=pn)
proname.place(x=230,y=90)

frame3.mainloop()

#############################################

import os
def select(pn,addd,myVar):
    if os.path.isfile("C:\\Dragon\dealer.txt"):
        with open("C:\\Dragon\dealer.txt") as p:
            for line in p:
                if myVar.get() == line.split(';')[0].strip():
                    pn.append(line.split(';')[1].strip())
                    addd.append(line.split(';')[2].strip())