在QTabWidget上设置关闭按钮

from PyQt5.QtCore import Qt, QSize
from PyQt5.QtWidgets import QTabWidget, QTabBar, QVBoxLayout, QWidget, QLabel

class CloseableTabBar(QTabBar):
    def __init__(self, parent=None):
        super().__init__(parent)

    def tabSizeHint(self, index):
        tab_size = super().tabSizeHint(index)
        tab_size.setWidth(tab_size.width() + 20)  # 增加关闭按钮的宽度
        return tab_size

class CloseableTabWidget(QTabWidget):
    def __init__(self, parent=None):
        super().__init__(parent)

        self.setTabBar(CloseableTabBar())
        self.tabBar().setExpanding(False)

        self.tabCloseRequested.connect(self.closeTab)

    def closeTab(self, index):
        if index >= 0:
            self.removeTab(index)

app = QApplication([])

tab_widget = CloseableTabWidget()

tab1 = QWidget()
tab1_layout = QVBoxLayout()
tab1_layout.addWidget(QLabel("Tab 1"))
tab1.setLayout(tab1_layout)

tab2 = QWidget()
tab2_layout = QVBoxLayout()
tab2_layout.addWidget(QLabel("Tab 2"))
tab2.setLayout(tab2_layout)

tab_widget.addTab(tab1, "Tab 1")
tab_widget.addTab(tab2, "Tab 2")

tab_widget.show()

app.exec_()