import sys

 from PyQt5.QtWidgets import QApplication, QWidget, QTextEdit, QTextBrowser, QPushButton, QGridLayout

 class Demo(QWidget):

     def __init__(self):

         super(Demo, self).__init__()

         self.text_edit = QTextEdit(self)

         self.text_browser = QTextBrowser(self)

         self.clipboard = QApplication.clipboard()  # 实例化剪贴板

         self.clipboard.dataChanged.connect(lambda: print('数据变化了'))#当数据发生变化时发出信号

         self.copy_btn = QPushButton('复制', self)

         self.copy_btn.clicked.connect(self.copy_func)

         self.paste_btn = QPushButton('粘贴', self)

         self.paste_btn.clicked.connect(self.paste_func)

         self.g_layout = QGridLayout()

         self.g_layout.addWidget(self.text_edit, 0, 0, 1, 1)

         self.g_layout.addWidget(self.text_browser, 0, 1, 1, 1)

         self.g_layout.addWidget(self.copy_btn, 1, 0, 1, 1)

         self.g_layout.addWidget(self.paste_btn, 1, 1, 1, 1)

         self.setLayout(self.g_layout)

     def copy_func(self):

         self.clipboard.setText(self.text_edit.toPlainText())#给剪贴板设置文本(纯文本)

     def paste_func(self):

         #方法一

         self.text_browser.setText(self.clipboard.text())

         #self.clipboard.text()  返回剪贴板的文本

         #方法二

         mime = self.clipboard.mimeData()  #返回剪贴板的mime数据。是对象

         if mime.hasText():

             self.text_browser.setText(mime.text())

             # mime.text() 获取mime对象中的文本

 if __name__ == '__main__':

     app = QApplication(sys.argv)

     demo = Demo()

     demo.show()

     sys.exit(app.exec_())