重用设计元素PyQt

Question

使用python和qt框架构建GUI应用程序时。我想重复使用某些UI元素而不是一遍又一遍地定义它们。在我的示例中，我想创建一个下拉菜单，用y（数字）和结果（数字）定义行数

应用示例

import sys
from PyQt5.QtWidgets import (QApplication, QWidget, QPushButton,
                             QLineEdit,  QGridLayout, QLabel)
from math import sqrt

class program(QWidget):

    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        self.setWindowTitle('Program')

        flow = QLabel('x1')
        pressuredrop_1 = QLabel('y1')
        pressuredrop_2 = QLabel('y2 ')
        kv = QLabel('result 1')
        kv_2 = QLabel('result 2')

        grid = QGridLayout()
        grid.setSpacing(10)

        self.setLayout(grid)
        self.setGeometry(300,300,300,150)

        self.btn = QPushButton('Calculate', self)

        self.flow = QLineEdit(self)
        self.pd = QLineEdit(self)
        self.result = QLineEdit(self)

        self.pd_2 = QLineEdit(self)
        self.kvresult_2 = QLineEdit(self)

        grid.addWidget(flow, 1,0)
        grid.addWidget(self.flow, 1, 1)

        grid.addWidget(pressuredrop_1, 2,0)
        grid.addWidget(self.pd, 2, 1)
        grid.addWidget(pressuredrop_2, 3,0)
        grid.addWidget(self.pd_2, 3, 1)

        grid.addWidget(kv, 2,2)
        grid.addWidget(self.result, 2,3)
        grid.addWidget(kv_2, 3,2)
        grid.addWidget(self.kvresult_2, 3,3)

        grid.addWidget(self.btn, 4,1)

        self.btn.clicked.connect(self.calculate)
        self.btn.clicked.connect(self.calculate_2)

        self.show()