综合实例-文本框类部件

import sys
from PyQt5.QtWidgets import QApplication, QLineEdit, QWidget, QFormLayout
from PyQt5.QtGui import QIntValidator, QDoubleValidator, QFont
from PyQt5.QtCore import Qt


class lineEditDemo(QWidget):

    def __init__(self):
        super(lineEditDemo, self).__init__()

        e1 = QLineEdit()
        e1.setValidator(QIntValidator())
        e1.setMaxLength(4)
        e1.setAlignment(Qt.AlignRight)
        e1.setFont(QFont("Arial", 20))
        e2 = QLineEdit()
        e2.setValidator(QDoubleValidator(0.99, 99.99, 2))
        flo = QFormLayout()
        flo.addRow("integer validator", e1)
        flo.addRow("Double validateor", e2)
        e3 = QLineEdit()
        e3.setInputMask("+99_9999_999999")
        flo.addRow("Input Mask", e3)
        e4 = QLineEdit()
        e4.textChanged.connect(self.textchanged)
        flo.addRow("Text changed", e4)
        e5 = QLineEdit()
        e5.setEchoMode(QLineEdit.Password)
        flo.addRow("Password", e5)
        e6 = QLineEdit("Hello PyQt5")
        e6.setReadOnly(True)
        flo.addRow("Read Only", e6)
        e5.editingFinished.connect(self.enterPress)
        self.setLayout(flo)
        self.setWindowTitle("QLineEdit例子")

    def textchanged(self, text):
        print("输入的内容为: "+ text)

    def enterPress(self):
        print("已输入值")

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

效果图：