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QLineEdit控件与回显模式

EchoMode()方法用来设置回显示模式，有下列4种回显模式。

• Normal
• NoEcho
• Password
• PasswordEchoOnEdit

代码如下：

import sysfrom PyQt5.QtWidgets import QApplication,QWidget,QLineEdit,QFormLayoutclass QLineEditDemo(QWidget):    def __init__(self):        super().__init__()        self.setupUI()    def setupUI(self):        # 创建4个演示用的QLineEdit        self.lineEdit_1 = QLineEdit(self)        self.lineEdit_2 = QLineEdit(self)        self.lineEdit_3 = QLineEdit(self)        self.lineEdit_4 = QLineEdit(self)        # 设置placehoder        self.lineEdit_1.setPlaceholderText("normal")        self.lineEdit_2.setPlaceholderText("noEcho")        self.lineEdit_3.setPlaceholderText("password")        self.lineEdit_4.setPlaceholderText("passwordEchoOnEdit")        # 设置回显示模式        self.lineEdit_1.setEchoMode(QLineEdit.Normal)        self.lineEdit_2.setEchoMode(QLineEdit.NoEcho)        self.lineEdit_3.setEchoMode(QLineEdit.Password)        self.lineEdit_4.setEchoMode(QLineEdit.PasswordEchoOnEdit)        # 创建一个formLayout        self.formLayout = QFormLayout()        self.formLayout.addRow("normal",self.lineEdit_1)        self.formLayout.addRow("noEcho", self.lineEdit_2)        self.formLayout.addRow("password", self.lineEdit_3)        self.formLayout.addRow("passwordEchoOnEdit", self.lineEdit_4)        self.setLayout(self.formLayout)if __name__ == '__main__':    app = QApplication(sys.argv)    mainWindow = QLineEditDemo()    mainWindow.show()    sys.exit(app.exec_())