Button does not perform a function when clicked

Question

Good night

I’m working with the TKINTER library and OS in Python. And I want that when I click the RUN button, the.py program will run my.BAT file.

But the.BAT file runs as soon as the.py program starts without the click.

How do I solve this problem?

Thanks in advance.

Follows the code

Note: The TEST script that I am importing is my module that is using the OS library to fetch the.BAT file

---

from tkinter import *

import teste

class aplication(Frame):

    def __init__(self, master = None):
        Frame.__init__(self, master)
        self.widget1 = Frame()
        self.widget1.pack()

        self.msg = Label(self.widget1, text='Problema relacionado a internet? ')
        self.msg.pack()

        self.BtnInternet = Button(self.widget1)
        self.BtnInternet["text"] = "Executar"
        self.BtnInternet.bind("<Button-1>", self.chamarbat)
        self.BtnInternet.pack()


    def chamarbat(self, event):
        return teste

root = Tk()

aplication(root)

root.mainloop()

---

script Test.py

import os

filepath = 'C:/Users/Pc1/PycharmProjects/.BAT_SweetMix/renew.bat'

dirs = os.startfile(filepath)