lineEdit访问& Python uic弹出窗口

from PyQt5.QtWidgets import QApplication, QLineEdit, QWidget, QVBoxLayout
import sys

class MyWidget(QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        layout = QVBoxLayout()
        lineEdit = QLineEdit()
        layout.addWidget(lineEdit)
        self.setLayout(layout)

if __name__ == '__main__':
    app = QApplication(sys.argv)
    widget = MyWidget()
    widget.show()
    sys.exit(app.exec_())

from PyQt5.QtWidgets import QApplication, QMessageBox

app = QApplication([])

# 创建信息框
msgBox = QMessageBox()
msgBox.setText("这是一个弹出窗口")
msgBox.setWindowTitle("提示")
msgBox.setIcon(QMessageBox.Information)
msgBox.addButton("确定", QMessageBox.AcceptRole)

# 显示弹出窗口
msgBox.exec_()