Aggregation in python?

Question

Python

Can you give a simple example of aggregation in python? How often do you use aggregation when creating web applications? When should you use it and not inheritance?

Answer 1

Here is an example of aggregation in python in this case i can't use inheritance

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


class EnterName(QWidget):
    text_value = pyqtSignal(str)
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        self.setGeometry(300, 300, 300, 50)
        self.setWindowTitle('Введите имя')
        

        self.button = QPushButton('Сохранить', self)
        self.button.clicked.connect(self.bEvent)
        self.button.move(120, 30)

        self.lEdid = QLineEdit(self)
        self.lEdid.setGeometry(0, 0, 300, 30)
        

    @pyqtSlot()
    def bEvent(self):
        self.text_value.emit(self.lEdid.text())
        self.hide()


class Example(QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        self.setGeometry(300, 300, 420, 280)
        self.setWindowTitle('Exsample')
        self.setWindowModality(Qt.WindowModal)

        self.button = QPushButton('Имя', self)
        self.button.move(180, 260)
        self.button.clicked.connect(self.bEvent)

        self.tb = QTextBrowser(self)
        self.tb.setGeometry(0, 0, 420, 260)

        self.eName = EnterName()
        self.eName.text_value.connect(self.signalHandler)

    def bEvent(self):
        self.eName.show()

    def signalHandler(self, text):
        self.tb.append(text)

if __name__ == '__main__':

    app = QApplication(sys.argv)
    example = Example()
    example.show()
    sys.exit(app.exec_())