I can’t close the Tkinter Window

Question

Well I am making a python application using Tkinter, I made a login window after checking user and password I would like to open a system window and close the login window. I’m breaking my head and I can’t find the error, if anyone can help I’ll be very grateful. I’ve researched everything I tried to last . quit . but does not close.

from tkinter import *
from sistemas import Sistema

class loginJanela:

    def __init__(self):

        self.Janela = Tk()
        self.Janela.title('nome')
        self.Janela.iconbitmap('icone.ico')
        w = self.Janela.winfo_screenwidth()
        h = self.Janela.winfo_screenheight()
        size = tuple(int(_) for _ in self.Janela.geometry().split('+')[0].split('x'))
        x = w/2 - size[0]/2
        y = h/2 - size[1]/2
        self.Janela.geometry("280x280+%d+%d" % (x,y))

        self.fontePadrao = ('Arial', "10")
        self.container1 = Frame(self.Janela)
        self.container1['pady'] = 20
        self.container1.pack()

        self.containerDados1 = Frame(self.Janela)
        self.containerDados1['padx'] = 50
        self.containerDados1.pack()

        self.containerDados2 = Frame(self.Janela)
        self.containerDados2['padx'] = 50
        self.containerDados2.pack()

        self.containerBotao = Frame(self.Janela)
        self.containerBotao['pady'] = 30
        self.containerBotao.pack()

        self.titulo = Label(self.container1, text='LOGIN')
        self.titulo['font'] = ('Arial', '10', 'bold')
        self.titulo.pack()

        self.loginId = Label(self.containerDados1, text='ID:')
        self.loginId['font'] = self.fontePadrao
        self.loginId.pack()

        self.usuario = Entry(self.containerDados1)
        self.usuario["width"] = 30
        self.usuario.pack()

        self.loginSenha = Label(self.containerDados2, text='Senha:')
        self.loginSenha['font'] = self.fontePadrao
        self.loginSenha.pack()

        self.senha = Entry(self.containerDados2, show='*')
        self.senha.bind('<Return>', self.verificaSenhaEnter)
        self.senha["width"] = 30
        self.senha.pack()

        self.botao = Button(self.containerBotao, text='Entrar')
        self.botao['font'] = ('Calibri', '10')
        self.botao['width'] = 12
        self.botao['command'] = self.verificaSenhaClick
        self.botao.pack()
        self.mensagem = Label(self.containerBotao, text='', font=self.fontePadrao)
        self.mensagem.pack()

        self.Janela.mainloop()

    def sair(self):
        self.Janela.quit()

    def abreSistema(self):
        self.container1.pack_forget()
        self.containerDados1.pack_forget()
        self.containerDados2.pack_forget()

        principal = Tk()
        principal.title('IMOBILIÁRIA SK')
        principal.iconbitmap('icone.ico')
        principal.geometry("800x600")

        Sistema(principal)
        principal.mainloop()


    def verificaSenhaClick(self):
        usuario = self.usuario.get()
        senha = self.senha.get()
        if usuario == '' and senha == '':
            self.mensagem['text'] = 'Autenticado'
            self.abreSistema()
            self.sair()

        else:
            self.mensagem['text'] = 'Erro na autenticação'



    def verificaSenhaEnter(self, event):
        usuario = self.usuario.get()
        senha = self.senha.get()
        if usuario == 'skimoveis' and senha == 'senhasecreta':
            self.mensagem['text'] = 'Autenticado'
            self.abreSistema()
            self.sair()

        else:
            self.mensagem['text'] = 'Erro na autenticação'





lp = loginJanela()

Answer 1

To close the previous window, you can call the method destroy() of the instance self.Janela, however, it must be called before to create the new instance (principal = Tk()). The code of the function abreSistema gets like this:

def abreSistema(self):
    self.container1.pack_forget()
    self.containerDados1.pack_forget()
    self.containerDados2.pack_forget()

    self.Janela.destroy() # <= Aqui, você "destrói" a instância self.Janela
    principal = Tk()
    principal.title('IMOBILIÁRIA SK')
    principal.iconbitmap('icone.ico')
    principal.geometry("800x600")

    Sistema(principal)
    principal.mainloop()

If you prefer to use the method sair:

def sair(self):
    self.Janela.destroy()

def abreSistema(self):
    self.container1.pack_forget()
    self.containerDados1.pack_forget()
    self.containerDados2.pack_forget()

    self.sair()
    principal = Tk()
    principal.title('IMOBILIÁRIA SK')
    principal.iconbitmap('icone.ico')
    principal.geometry("800x600")

    Sistema(principal)
    principal.mainloop()

And there’s no need to call sair within the method verificaSenhaClick.

It is not recommended to use more than one Tk instance in the same application and possibly the problem occurred due to the second instance being created before the first one was destroyed.

Alternatively, you modify the application to create only one root instance, and open the new window(s) (s) with the command: Toplevel (documentation in English: python and tkdocs)