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
Qt Code: 
  1. import sys
  2. from PyQt5.QtWidgets import QApplication, QMainWindow, QWidget
  3. from PyQt5 import uic
  4. import Con_pos
  5. from Registro import Registro
  6.  
  7. class Login(QWidget):
  8.  
  9.     def __init__(self):
  10.         QWidget.__init__(self)
  11.         uic.loadUi("Login.ui", self)
  12.         self.registro.clicked.connect(self.view_Registro)
  13.         self.show()
  14.  
  15.     def view_Registro(self):
  16.         reg = Registro.Registro()
  17.         reg.show()
  18.  
  19. if __name__ == "__main__":
  20.     app = QApplication(sys.argv)
  21.     login = Login()
  22.     sys.exit(app.exec())
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class Registro

Qt Code: 
  1. import sys
  2. from PyQt5.QtWidgets import QApplication, QMainWindow
  3. from PyQt5 import uic
  4. import Con_pos
  5. import error_log as error
  6.  
  7. ui_clase = uic.loadUi("Registro.ui")
  8. class Registro(ui_clase):
  9.     con = Con_pos.con_pos()
  10.     def __init__(self, parent = None):
  11.         super(ui_clase, self).__init__(parent)
  12.         self.setupUi(self)
  13.         self.btn_reg.clicked.connect(self.validar_nombre)
  14.         self.show()
  15.  
  16.     def validar_nombre(self):
  17.         nom = self.nom_tx_input.text()
  18.         usuario = self.user_tx_input.text()
  19.         password = self.pass_tx_input.text()
  20.         if usuario != "":
  21.             pid = self.getPID()
  22.             consul = '''SELECT "id_user" FROM "User" WHERE "id_user" = '%s'; ''' % (usuario)
  23.             res_con = Registro.con.consulta(consul)
  24.  
  25.             if not res_con:
  26.                 ins_user = '''INSERT INTO "User" VALUES ('%s', '%s', '%s') ''' % (usuario, nom, password)
  27.                 ins_sesion = ''' INSERT INTO "sesion" VALUES (%s, '%s') ''' % (pid, usuario)
  28.                 Registro.con.insertar(ins_user)
  29.                 Registro.con.insertar(ins_sesion)
  30.             else:
  31.                 err = error.error_dia()
  32.                 err.etiqueta.setText("El usuario %s ya esta en uso" % (usuario))
  33.                 err.exec()
  34.  
  35.     def getPID(self):
  36.         func = "pg_backend_pid"
  37.         pid = Registro.con.call_proc(func)
  38.         pid = pid[0][0]
  39.         return pid
  40.  
  41. if __name__ == "__main__":
  42.     app = QApplication(sys.argv)
  43.     ventana = Registro()
  44.     ventana.show()
  45.     sys.exit(app.exec())
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