PyQt5中布局内的控件如何充满布局？

Question

如图，PyQt5中布局内的控件如何充满布局？

class CodeVersionDlg(QDialog):

def __init__(self, parent=None):
    super(CodeVersionDlg, self).__init__(parent)
    windowFlag  = Qt.Dialog;
    windowFlag |= Qt.WindowMinimizeButtonHint;
    windowFlag |= Qt.WindowMaximizeButtonHint;
    windowFlag |= Qt.WindowCloseButtonHint;
    self.setWindowFlags(windowFlag);

    self.CodetxtPlainTextEdit = QPlainTextEdit()
    self.CodetxtPlainTextEdit.setContextMenuPolicy(Qt.CustomContextMenu)
    self.CodetxtPlainTextEdit.customContextMenuRequested[QPoint].connect(self.generateMenu4)
    self.CodeversiontxtPlainTextEdit = QPlainTextEdit()
    self.tableViewnew=QTableView()
    self.model=QStandardItemModel(6,4)
    self.tableViewnew.setModel(self.model)
    self.tableViewnew.setColumnWidth(0,350)
    
    tabWidget = QTabWidget()
    CodetxtWidget = QWidget()
    CodetxtLayout = QGridLayout()
    CodetxtLayout.addWidget(self.CodetxtPlainTextEdit, 1, 0)
    CodetxtLayout.addWidget(self.tableViewnew, 2, 0)
    CodetxtWidget.setLayout(CodetxtLayout)
    tabWidget.addTab(CodetxtWidget, "A")
  
    self.model2=QStandardItemModel(4,3)
    #设置水平方向四个头标签文本内容
    self.model2.setHorizontalHeaderLabels(['old version','newer version','append'])
            
    self.btn3 = QPushButton("append newer")
    #实例化表格视图，设置模型为自定义的模型
    self.tableViewnew2=QTableView()
    self.tableViewnew2.setModel(self.model2)
    self.tableViewnew2.setColumnWidth(0,32)
    self.tableViewnew2.setColumnWidth(1,500)
    self.tableViewnew2.setColumnWidth(2,500)
    #self.tableViewnew2.setSectionResizeMode(QHeaderView.Stretch)
    self.tableViewnew2.setContextMenuPolicy(Qt.CustomContextMenu)
     
    newWidget = QWidget()
    newLayout = QGridLayout()
    newLayout.addWidget(self.tableViewnew2, 1, 0)
    
    newLayout.addWidget(self.btn3)
    newWidget.setLayout(newLayout)
    tabWidget.addTab(newWidget, "B")
    
    self.btn4 = QPushButton("modify older text")
    self.btn5 = QPushButton("err code text2clip")
    self.btn5.setToolTip('拷贝到剪切板')
    
    self.tableViewOld=QTableView()
    self.model3=QStandardItemModel(3,3)
    self.tableViewOld.setModel(self.model3)
    self.tableViewOld.setColumnWidth(0,32)
    self.tableViewOld.setColumnWidth(1,500)
    self.tableViewOld.setColumnWidth(2,500)
    self.tableViewOld.setContextMenuPolicy(Qt.CustomContextMenu)
    
    checkWidget = QWidget()
    checkLayout = QGridLayout()
    checkLayout.addWidget(self.tableViewOld, 1, 0,1,2)
    checkLayout.addWidget(self.btn4,2,0)
    checkLayout.addWidget(self.btn5,2,1)
    
    checkWidget.setLayout(checkLayout)
    tabWidget.addTab(checkWidget, "C")
    
    self.tableViewIn=QTableView()
    self.model4=QStandardItemModel(3,1)
    self.tableViewIn.setModel(self.model4)
    self.tableViewIn.setColumnWidth(0,500)
    
    inWidget = QWidget()
    inLayout = QGridLayout()
    inLayout.addWidget(self.tableViewIn, 1, 0,1,2)
    inWidget.setLayout(inLayout)
    tabWidget.addTab(inWidget, "D")
    
    layout = QVBoxLayout()
    layout.addWidget(tabWidget)
    self.setLayout(layout)
    
    self.tableViewIn.setContextMenuPolicy(Qt.CustomContextMenu)

    self.codeSumLabel = QLabel("found:")
    self.codeSumLabel2 = QLabel("found:")
    self.btn1 = QPushButton("Version Check")
    #layout.addWidget(self.btn1)
   
    self.btn2 = QPushButton('quit')
    #self.btn2.clicked.connect(QApplication.instance().quit)
    self.btn2.clicked.connect(self.myquit)
    #layout.addWidget(self.btn2)
  

    hbox = QHBoxLayout()
    hbox.addStretch(1)
    hbox.addWidget(self.codeSumLabel)
    hbox.addWidget(self.codeSumLabel2)
    hbox.addWidget(self.btn1)
    hbox.addWidget(self.btn2)
    
    layout.addStretch(0)
    layout.addStretch(1)
    layout.addLayout(hbox)       
    self.setLayout(layout)
    
    self.resize(1100,650)
    print(self.geometry())