from PyQt5.QtWidgets import QApplication, QLineEdit, QVBoxLayout, QWidget app = QApplication([]) window = QWidget() layout = QVBoxLayout() edit = QLineEdit() layout.addWidget(edit) window.setLayout(layout) window.show() # Disable signals from the QLineEdit widget edit.blockSignals(True) # Update the text of the QLineEdit widget without triggering other events edit.setText("Hello, world!") # Re-enable signals from the QLineEdit widget edit.blockSignals(False)In this example, we create a simple QWidget and QVBoxLayout layout, and add a QLineEdit widget to the layout. We then use the blockSignals method to temporarily disable signals from the QLineEdit widget, update its text with setText, and re-enable the signals. Overall, the PyQt5.QtWidgets package library provides a powerful set of tools for building graphical user interfaces in Python, including the QLineEdit widget and its blockSignals method.