for python work

https://www.tutorialspoint.com/pyqt/pyqt_qlineedit_widget.htm

# -*- coding: utf-8 -*-"""Created on %(date)s
@author: %(username)s"""import sys
from PyQt5.QtCore import *from PyQt5.QtGui import *from PyQt5.QtWidgets import *

class window(QWidget):
    def __init__(self):        super(window, self).__init__()
        self.initUI()

    def initUI(self):        self.e1 = QLineEdit()
        self.e1.setValidator(QIntValidator())
        self.e1.setMaxLength(4)
        self.e1.setAlignment(Qt.AlignRight)
        self.e1.setFont(QFont("Arial", 20))

        self.e2 = QLineEdit()
        self.e2.setValidator(QDoubleValidator(0.99, 99.99, 2))

        flo = QFormLayout()
        flo.addRow("integer validator", self.e1)
        flo.addRow("Double validator", self.e2)

        self.e3 = QLineEdit()
        self.e3.setInputMask('+99_9999_999999')
        flo.addRow("Input Mask", self.e3)

        self.e4 = QLineEdit()
        self.e4.setInputMask('99999')
        self.e4.setText("0")
        self.e4.textChanged.connect(self.textchanged)
        self.e4.textChanged.connect(self.checkText1)
        flo.addRow("Text changed", self.e4)

        self.e44 = QLineEdit()
        self.e44.setValidator(QIntValidator(1, 5000))
        self.e44.setText("5000")
        self.e44.textChanged.connect(self.checkText2)
        flo.addRow("Text checked", self.e44)

        self.e5 = QLineEdit()
        self.e5.setEchoMode(QLineEdit.Password)
        flo.addRow("Password", self.e5)

        self.e6 = QLineEdit("Hello Python")
        self.e6.setReadOnly(True)
        flo.addRow("Read Only", self.e6)

        self.e5.editingFinished.connect(self.enterPress)
        self.setLayout(flo)
        self.setWindowTitle("PyQt")

    def textchanged(self,text):        print ("contents of text box: " + text)


    def enterPress(self):        print ("edited")

    def checkText1(self, text):        if text and float(text) >= int(self.e44.text()):                self.errorDiag = QErrorMessage()
                self.errorDiag.showMessage("should smaller than e44")

    def checkText2(self,text):        if text and float(text) <= int(self.e4.text()):            self.errorDiag=QErrorMessage()
            self.errorDiag.showMessage("should smaller than e4")



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