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import sysfrom PyQt5.QtWidgets import *from PyQt5.QtCore import *from PyQt5.QtGui import *class QFontDialogDemo(QWidget):    def __init__(self):        super(QFontDialogDemo,self).__init__()        self.initUI()    def initUI(self):        self.setWindowTitle('Font Dialog案例')        self.resize(300,200)        layout =QVBoxLayout()        self.fontbtn = QPushButton('选择字体')        self.fontbtn.clicked.connect(self.getFont)        self.fontlabel =QLabel('测试字体')        self.fontlabel.setAlignment(Qt.AlignCenter)        layout.addWidget(self.fontbtn)        layout.addWidget(self.fontlabel)        self.setLayout(layout)    def getFont(self):        font,ok = QFontDialog.getFont()        if ok:            self.fontlabel.setFont(font)if __name__ == '__main__':    app =QApplication(sys.argv)    main = QFontDialogDemo()    main.show()    app.exit(app.exec_())

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