from PyQt5.QtWidgets import QApplication, QWidget, QPlainTextEdit, QInputDialog,QLineEdit, QFileDialog, QGridLayout, QGroupBox, QLabel,QMessageBox, QPushButton
from PyQt5.QtGui import QIcon, QPixmap

def on_open_button_clicked():
    options = QFileDialog.Options()
    options |= QFileDialog.DontUseNativeDialog
    openFilePath, _ = QFileDialog.getOpenFileName(widget,"Wybierz plik obrazu", "","Text Files (*.txt)", options=options)
    if openFilePath:
        s = open(openFilePath, 'r').read()
        editArea.setPlainText(s)


def on_save_button_clicked():
    text = editArea.toPlainText()
    saveFilePath, _ = QFileDialog.getSaveFileName(None, "tytul", "name", None, None)
    if saveFilePath:
        print(saveFilePath)
        file = open(saveFilePath, "w")
        file.write(text)
        file.close()



app = QApplication([])
horizontalGroupBox = QGroupBox("Nazwa grupy")
layout = QGridLayout()
widget = QWidget()
widget.setWindowTitle("Title!!")
openButton = QPushButton('Otworz plik')
openButton.clicked.connect(on_open_button_clicked)
saveButton = QPushButton('Zapisz plik')
saveButton.clicked.connect(on_save_button_clicked)
layout.addWidget(openButton)
layout.addWidget(saveButton)
editArea = QPlainTextEdit(widget)
layout.addWidget(editArea)


horizontalGroupBox.setLayout(layout)
horizontalGroupBox.show()
app.exec_()