File(IO)

from PySide2.QtCore import (QCoreApplication, QDate, QDateTime, QMetaObject,
    QObject, QPoint, QRect, QSize, QTime, QUrl, Qt)
from PySide2.QtGui import (QBrush, QColor, QConicalGradient, QCursor, QFont,
    QFontDatabase, QIcon, QKeySequence, QLinearGradient, QPalette, QPainter,
    QPixmap, QRadialGradient)
from PySide2 import QtCore, QtWidgets, QtGui


from PySide2.QtWidgets import *
import sys, os

class Ui_main(QWidget):
    def __init__(self):
        super().__init__()
        self.main_ui()

    def main_ui(self):
        self.setWindowTitle("Text Editor")
        self.wr = QTextEdit()
        self.b1 = QPushButton()
        self.b1.setText("Save")
        self.vbox = QVBoxLayout()

        self.vbox.addWidget(self.wr)
        self.vbox.addWidget(self.b1)
        self.setLayout(self.vbox)
        self.show()

        self.b1.clicked.connect(self.saveit)

    def saveit(self):
        self.wr1 = self.wr.toPlainText()
        f = open("FileSave.txt","w")
        f.write(self.wr1)
        self.close()



app = QApplication(sys.argv)
main = Ui_main()
sys.exit(app.exec_())