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import sysfrom PyQt5.QtWidgets import *from PyQt5.QtCore import *from PyQt5.QtGui import *class QFileDialogDemo(QWidget):    def __init__(self):        super(QFileDialogDemo,self).__init__()        self.initUI()    def initUI(self):        layout = QVBoxLayout()        self.btn1 = QPushButton('加载图片')        self.btn2 = QPushButton('加载文本')        self.contents = QTextEdit()        self.btn1.clicked.connect(self.loadimage)        self.btn2.clicked.connect(self.loadtext)        self.imagelabel = QLabel()        layout.addWidget(self.btn1)        layout.addWidget(self.imagelabel)        layout.addWidget(self.btn2)        self.setLayout(layout)        self.setWindowTitle('文件对话框')    def loadimage(self):        #打开单个文件        fname,_=QFileDialog.getOpenFileName(self,'打开文件','.','图像文件（*.jpg *.png')        self.imagelabel.setPixmap(QPixmap(fname))    def loadtext(self):        dialog = QFileDialog()        dialog.setFileMode(QFileDialog.AnyFile)        dialog.setFilter(QDir.Files)        if dialog.exec():            filenames =dialog.sellectedFiles()            f = open(filenames[0],'r')            with f:                data = f.read()                self.contents.setText(data)if __name__ == '__main__':    app =QApplication(sys.argv)    main = QFileDialogDemo()    main.show()    sys.exit(app.exec_())

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