import sys
from PyQt5.QtWidgets import *
from PyQt5.QtCore import *
from PyQt5.QtGui import *"""
下面示例揭示了，当关键字绑定的控件出现的时候，快捷键才管用，
绑定的控件没有出现的时候快捷键无效
"""class Demo1(QMainWindow):def __init__(self):super().__init__()form_layout = QFormLayout()self.text_edit = QTextEdit()shortcut_show_msg = QShortcut(QKeySequence(Qt.CTRL + Qt.Key_M), self.text_edit)shortcut_show_msg.activated.connect(lambda: print('你好'))button = QPushButton("显示/隐藏")button.clicked.connect(self.show_or_hide)form_layout.addRow("文本行", self.text_edit)form_layout.addWidget(QTextEdit())form_layout.addWidget(button)widget = QWidget()widget.setLayout(form_layout)self.setCentralWidget(widget)def show_or_hide(self):if self.text_edit.isVisible():self.text_edit.setVisible(False)else:self.text_edit.setVisible(True)if __name__ == '__main__':app = QApplication(sys.argv)window = Demo1()window.show()sys.exit(app.exec_())