PyQt打印QWidget

from PyQt5.QtWidgets import QApplication, QWidget, QPushButton, QVBoxLayout
from PyQt5.QtPrintSupport import QPrinter, QPrintDialog
from PyQt5.QtGui import QPainter

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

    def initUI(self):
        self.setWindowTitle('Print QWidget Example')

        printButton = QPushButton('Print', self)
        printButton.clicked.connect(self.printWidget)

        layout = QVBoxLayout()
        layout.addWidget(printButton)
        self.setLayout(layout)

    def printWidget(self):
        printer = QPrinter()
        dialog = QPrintDialog(printer, self)
        if dialog.exec_() == QPrintDialog.Accepted:
            painter = QPainter(printer)
            self.render(painter)
            painter.end()

if __name__ == '__main__':
    app = QApplication([])
    widget = MyWidget()
    widget.show()
    app.exec_()