How do I get the variable x, which is the length of the input characters of an html field, into the mousePressEvent function?

Question

How do I access the variable x, which is the length of the input characters of an html input field, into the mousePressEvent function? And the variable x is a dynamic variable that increases with the length of each character. I want to control the text input dimensions inside the mousePressEvent. But I can not access the variable x.

import sys
import os
from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
from PyQt5.QtCore import *
from PyQt5 import QtCore, QtWidgets, QtWebEngineWidgets, 
QtWebChannel


class MainWindow(QMainWindow):
    def __init__(self, *args, **kwargs):
        super(MainWindow, self).__init__(*args, **kwargs)
        self.x = 50
        self.setGeometry(300, 200, 800, 600)
        self.channel = QtWebChannel.QWebChannel(self)
        self.channel.registerObject("backend", self)
        self.show()

    @QtCore.pyqtSlot(str)
    def pyFun1(self, x):
        self.x = x
        print(self.x)
    
    def mousePressEvent(self, e):
        self.view = QtWebEngineWidgets.QWebEngineView(self)
        self.view.resize(self.x, 40)
        self.view.page().setWebChannel(self.channel)
        self.view.load(QtCore.QUrl().fromLocalFile(
            os.path.split(os.path.abspath(__file__)) 
[0]+r'\index.html'))
        self.view.move(QPoint(e.x(), e.y()))
        self.view.show()

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