When I use MainWindow.hide() funtion, it gives me an error stating MainWindow is not defined but same MainWindow works in setupUI and retranslateUI - mysql

Question

I am fairly new to PyQt5. So here, I am trying to work on a project in which first window in login page dialog window. So if password entered are correct it will open another window.
def login(self):
eid=self.lineEdit.text()
epass=self.lineEdit_2.text()
if eid==idd and epass==passs:
from BloodBank import Ui_MainWindow
self.MainWindow = QtWidgets.QMainWindow()
self.ui = Ui_MainWindow()
self.ui.setupUi(self.MainWindow)
LoginPage.hide()
self.MainWindow.show()
else:
self.msgdlg("Wrong ID or Password!")
In this Window, from title bar menu action, I tried to attach yet another window, which when opened, current window become hidden. For this I wrote following code:
def menu(self,action):
txt=(action.text())
if txt=="Blood":
try:
from Blood import Ui_MainWindow
self.MainWindow1 = QtWidgets.QMainWindow()
self.ui = Ui_MainWindow()
self.ui.setupUi(self.MainWindow1)
MainWindow.hide()
self.ui.updatelist()
self.MainWindow1.show()
except Exception as e:
print(e)
Now, When I run above code without MainWindow.hide() it run perfectly fine. But as soon as I feed MainWindow.hide() it gives following error.
name 'MainWindow' is not defined
When I try same .hide() funtion with login page, it works.
What do I need to do so I can hide my window?

Answer 1

Your code is a bit unclear, but i think it should be self.MainWindow.hide() because we are trying to hide our parent widget.
Edit
Try self.hide() in the bloodbank file instead of MainWindow.hide() I am assuming that in the file bloodbank you have your mainwindow.
Here is the problem, you have two files the Login File which consists of the loginpage and the bloodbank file.
when you created a the instance of self.MainWindow it is only in the namespace of the loginpage.
And you try to open a another window from this file (which is the 2nd part of your code). MainWindow instance is not present because you have defined (instantiated) in another file (login page).