How to import modules ,Class Names dynamically in python PyQt5?

My attempt is to try to import modules and their depending classes dynamically. Here is my code. File "Sample_tabwidget_base.py" have three classes names "Contact", "Personal" and "Educational". And I need to import all those classes into my file "sample_tabwidget.py" dynamically. Googleing so many items and trying them, But lack of knowledge, I can't succeed.

File : sample_tabwidget.py

import sys
from PyQt5.QtWidgets import *
# from sample_tabwidget_base import *
import importlib
module = importlib.import_module('sample_tabwidget_base')
print(module.__doc__)

# class_ = getattr(module)
# module = __import__("sample_tabwidget_base")
# mod = getattr(module,'Contact')
# print(mod)

class MainPage(QWidget):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("QTabWidget Samples")
        self.showMaximized()
        self.subwindow = None
        self.Ui()
        self.show()


    def Ui(self):

        self.tab = QTabWidget()
        self.tab.setTabsClosable(True)
        self.tab.setTabShape(QTabWidget.Rounded)
        self.tab.setTabPosition(QTabWidget.North)
        self.tab.setMovable(True)
        self.tab.setDocumentMode(True)
        self.tab.setAutoFillBackground(True)
        self.tab.setStyleSheet(stylesheet())
        font = self.tab.font()
        font.setPointSize(10)
        self.tab.setFont(font)

        self.right_layout = QHBoxLayout()
        self.main_layout = QHBoxLayout()

        self.right_frame = QFrame()
        self.right_frame.setObjectName("rightframe")
        self.right_frame.setStyleSheet(f"QFrame#rightframe{{background-color: lightgreen;}}")
        self.right_frame.setContentsMargins(0,0,0,0)

        self.right_frame.setLayout(self.right_layout)
        self.right_layout.setContentsMargins(15,0,0,0)
        self.right_layout.addWidget(self.tab)

        self.main_layout.setContentsMargins(0,0,0,0)
        self.main_layout.addWidget(self.right_frame)
        self.main_layout.addStretch()

        self.contacttab = Contact()
        self.personaltab = Personal()
        self.educationaltab = Educational()
        
        self.setLayout(self.main_layout)
        self.tab.addTab(self.contacttab, "Contacts")
        self.tab.addTab(self.personaltab,"Personal")
        self.tab.addTab(self.educationaltab,"Educational")

def stylesheet():

    return """
      QTabBar {background-color: grey;}

      QTabWidget::pane {border: 0px solid yellow; top:-1px; background: grey; }

      QTabBar::tab:hover{background-color:yellow;}

      QTabBar::tab {background-color: grey; color : black;
                    border-left: 1px solid grey;border-top:1px solid grey;border-right:1px solid grey;
                    text-align:centre ;  font-family:Trebuchet MS; padding : 10px; }
  
      QTabBar::tab:selected {background: lightgrey;color : Black;border-bottom:5px solid red;margin-bottom: -1px;
                             text-align:centre ;  font-family:Trebuchet MS; color:Black; padding : 10px;}
    """

if __name__ == "__main__":
    app = QApplication(sys.argv)
    mainwindow = MainPage()
    app.setStyle("windows vista")
    mainwindow.show()
    sys.exit(app.exec_())

File : smaple_tabwidget_base.py

import sys
from PyQt5.QtWidgets import *

class Contact(QWidget):
    def __init__(self):
        super().__init__()
        print("its a contact class")
        self.setWindowTitle("Contact Details")
        self.layout = QFormLayout()
        self.layout.addRow("Name", QLineEdit())
        self.layout.addRow("Address", QLineEdit())
        self.setLayout(self.layout)

class Personal(QWidget):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("Personal Details")
        self.layout = QFormLayout()
        self.sex = QHBoxLayout()
        self.sex.addWidget(QRadioButton("Male"))
        self.sex.addWidget(QRadioButton("Female"))
        self.layout.addRow(QLabel("Sex"), self.sex)
        self.layout.addRow("Date of Birth", QLineEdit())
        self.setLayout(self.layout)

class Educational(QWidget):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("Educational Details")
        self.layout = QHBoxLayout()
        self.layout.addWidget(QLabel("subjects"))
        self.layout.addWidget(QCheckBox("Physics"))
        self.layout.addWidget(QCheckBox("Maths"))
        self.setLayout(self.layout)