How to create a window that opens another window with uic module ?? HELP!

Hi all, I have a problem when trying to develop a GUI with PyQt5 and QT desginer.
I want to use the "uic" module, I have a .ui file called "registro.ui", and another "login.ui", as I can call from "login.ui" to the "registry.ui",by clicking on registry

My intention is to click the register button, and open the registration window

Using only the uic.loadUI () method?

Here I show my code

Ventana Login

Code:

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import sys
from PyQt5.QtWidgets import QApplication, QMainWindow, QWidget
from PyQt5 import uic
import Con_pos
from Registro import Registro
 
class Login(QWidget):
 
    def __init__(self):
        QWidget.__init__(self)
        uic.loadUi("Login.ui", self)
        self.registro.clicked.connect(self.view_Registro)
        self.show()
 
    def view_Registro(self):
        reg = Registro.Registro()
        reg.show()
 
if __name__ == "__main__":
    app = QApplication(sys.argv)
    login = Login()
    sys.exit(app.exec())

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class Registro

Code:

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import sys
from PyQt5.QtWidgets import QApplication, QMainWindow
from PyQt5 import uic
import Con_pos
import error_log as error
 
ui_clase = uic.loadUi("Registro.ui")
class Registro(ui_clase):
    con = Con_pos.con_pos()
    def __init__(self, parent = None):
        super(ui_clase, self).__init__(parent)
        self.setupUi(self)
        self.btn_reg.clicked.connect(self.validar_nombre)
        self.show()
 
    def validar_nombre(self):
        nom = self.nom_tx_input.text()
        usuario = self.user_tx_input.text()
        password = self.pass_tx_input.text()
        if usuario != "":
            pid = self.getPID()
            consul = '''SELECT "id_user" FROM "User" WHERE "id_user" = '%s'; ''' % (usuario)
            res_con = Registro.con.consulta(consul)
 
            if not res_con:
                ins_user = '''INSERT INTO "User" VALUES ('%s', '%s', '%s') ''' % (usuario, nom, password)
                ins_sesion = ''' INSERT INTO "sesion" VALUES (%s, '%s') ''' % (pid, usuario)
                Registro.con.insertar(ins_user)
                Registro.con.insertar(ins_sesion)
            else:
                err = error.error_dia()
                err.etiqueta.setText("El usuario %s ya esta en uso" % (usuario))
                err.exec()
 
    def getPID(self):
        func = "pg_backend_pid"
        pid = Registro.con.call_proc(func)
        pid = pid[0][0]
        return pid
 
if __name__ == "__main__":
    app = QApplication(sys.argv)
    ventana = Registro()
    ventana.show()
    sys.exit(app.exec())

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I'm not sure what you mean. The code you posted seems to be correct.

Quote:

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The code you posted seems to be correct

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except that in the post, the OP says the files are named "registro.ui" and "login.ui", while the code refers to them as "Registro.ui" and "Login.ui". If the file system is case sensitive and the files are really named in lowercase, then they won't be found. The OP also refers to "registry.ui", which isn't anywhere in the code.