如何将QLineEdit的文本放入方法中？

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

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

    def initUI(self):
        # 创建布局
        layout = QVBoxLayout()

        # 创建QLineEdit控件
        self.line_edit = QLineEdit(self)
        layout.addWidget(self.line_edit)

        # 创建按钮，点击时调用方法
        self.button = QPushButton('Submit', self)
        self.button.clicked.connect(self.on_submit)
        layout.addWidget(self.button)

        # 设置窗口布局
        self.setLayout(layout)
        self.setWindowTitle('QLineEdit Example')

    def on_submit(self):
        # 获取QLineEdit中的文本
        text = self.line_edit.text()
        # 将文本传递给方法
        self.process_text(text)

    def process_text(self, text):
        # 在这里处理文本
        print(f'You entered: {text}')

if __name__ == '__main__':
    app = QApplication([])
    ex = MyApp()
    ex.show()
    app.exec_()