Example 1

              from PyQt5.QtCore import *
from PyQt5.QtWidgets import *
import sys

class Window(QWidget):
    def __init__(self):
        QWidget.__init__(self)
        layout = QGridLayout()
        self.setLayout(layout)
        label1 = QLabel("Widget in Tab 1.")
        label2 = QLabel("Widget in Tab 2.")
        tabwidget = QTabWidget()
        tabwidget.addTab(label1, "Tab 1")
        tabwidget.addTab(label2, "Tab 2")
        layout.addWidget(tabwidget, 0, 0)

app = QApplication(sys.argv)
screen = Window()
screen.show()
sys.exit(app.exec_())

Example 2

import sys
from PyQt5.QtWidgets import QMainWindow, QApplication, QPushButton, QWidget, QAction, QTabWidget,QVBoxLayout
from PyQt5.QtGui import QIcon
from PyQt5.QtCore import pyqtSlot

class App(QMainWindow):

    def __init__(self):
        super().__init__()
        self.title = 'PyQt5 tabs - pythonspot.com'
        self.left = 0
        self.top = 0
        self.width = 300
        self.height = 200
        self.setWindowTitle(self.title)
        self.setGeometry(self.left, self.top, self.width, self.height)
        
        self.table_widget = MyTableWidget(self)
        self.setCentralWidget(self.table_widget)
        
        self.show()
    
class MyTableWidget(QWidget):
    
    def __init__(self, parent):
        super(QWidget, self).__init__(parent)
        self.layout = QVBoxLayout(self)
        
        # Initialize tab screen
        self.tabs = QTabWidget()
        self.tab1 = QWidget()
        self.tab2 = QWidget()
        self.tabs.resize(300,200)
        
        # Add tabs
        self.tabs.addTab(self.tab1,"Tab 1")
        self.tabs.addTab(self.tab2,"Tab 2")
        
        # Create first tab
        self.tab1.layout = QVBoxLayout(self)
        self.pushButton1 = QPushButton("PyQt5 button")
        self.tab1.layout.addWidget(self.pushButton1)
        self.tab1.setLayout(self.tab1.layout)
        
        # Add tabs to widget
        self.layout.addWidget(self.tabs)
        self.setLayout(self.layout)
        
    @pyqtSlot()
    def on_click(self):
        print("\n")
        for currentQTableWidgetItem in self.tableWidget.selectedItems():
            print(currentQTableWidgetItem.row(), currentQTableWidgetItem.column(), currentQTableWidgetItem.text())

if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = App()
    sys.exit(app.exec_())