PyQt5 - Can QTabWidget content extend up to Main Window edges, even with no content? - python-3.x

Question

I am new to PyQt5... Simple question here.
I am using PyQt5 to build a simple application. This application has a Main Window containing a QTabWidget with 3 tabs. Once the application starts, all tab pages are empty and get filled later on. When tab pages are empty, I would still like them to appear as blank pages and extend up to the Main Window edges.
I've been trying to achieve this in two ways: using a layout and using the setGeometry function. Yet the tab pages never extend vertically very far, and horizontally they never go beyond the last tab. See code below.
import sys
from PyQt5.QtWidgets import *
class MainWindow(QWidget):
def __init__(self):
super().__init__()
self.setWindowTitle("Window With Tabs")
self.setGeometry(50,50,400,400)
oTabWidget = QTabWidget(self)
oPage1 = QWidget()
oLabel1 = QLabel("Hello",self)
oVBox1 = QVBoxLayout()
oVBox1.addWidget(oLabel1)
oPage1.setLayout(oVBox1)
oPage2 = QWidget()
oPage2.setGeometry(0,0,400,400)
oPage3 = QWidget()
oPage3.setGeometry(0,0,400,400)
oTabWidget.addTab(oPage1,"Page1")
oTabWidget.addTab(oPage2,"Page2")
oTabWidget.addTab(oPage3,"Page3")
self.show()
if __name__ == "__main__":
app = QApplication(sys.argv)
oMainwindow = MainWindow()
sys.exit(app.exec_())
Any idea how to modify the code so the empty pages will extend up to the edges of Main Window ?

Answer 1

Set a layout on the main widget:
class MainWindow(QWidget):
def __init__(self):
super().__init__()
self.setWindowTitle("Window With Tabs")
self.setGeometry(50,50,400,400)
layout = QVBoxLayout(self)
oTabWidget = QTabWidget(self)
layout.addWidget(oTabWidget)
The setGeometry calls on the other widgets are redundant.

Answer 2

import sys
from PyQt5.QtWidgets import *
class MainWindow(QWidget):
# window object
def __init__(self):
super().__init__()
self.initGUI() # call custom code
def initGUI(self):
self.setWindowTitle("Window With Tabs") # window...
self.setGeometry(50,50,400,400) #...properties
TabW=self.createTabs() # a custom-tab object
layout = QVBoxLayout(self) # main window layout
layout.addWidget(TabW) #populate layout with Tab object
self.show() # display window
def createTabs(self): # create and return Tab object
oPage1 = QWidget() # tabs...
oPage2 = QWidget()
oPage3 = QWidget()
oTabWidget = QTabWidget() # Tabobject
oTabWidget.addTab(oPage1,"Page1") # populate tab object...
oTabWidget.addTab(oPage2,"Page2")
oTabWidget.addTab(oPage3,"Page3")
return oTabWidget # return tab object
if __name__ == "__main__": # Rest is History!
app = QApplication(sys.argv)
oMainwindow = MainWindow()
sys.exit(app.exec_())