How can I take a value from a line edit to another window's line edit by using Python and PyQt5? - python-3.x

Question

What I need:
I need to create a simple project that can take value from window to another window
My research effort:
So, I create two classes for two windows then connect to classes with each other, so when I click in button it takes the value from 1st window then open the other window but the value=nothing because the clickMethod returns nothing.
Below is my code:
import sys
from PyQt5 import QtCore, QtWidgets
from PyQt5.QtWidgets import QMainWindow, QWidget, QLabel, QLineEdit
from PyQt5.QtWidgets import QPushButton
from PyQt5.QtCore import QSize
class MainWindow(QMainWindow):
def __init__(self):
QMainWindow.__init__(self)
self.setMinimumSize(QSize(320, 140))
self.setWindowTitle("First Window")
self.nameLabel = QLabel(self)
self.nameLabel.setText('1st:')
self.line = QLineEdit(self)
self.line.move(80, 20)
self.line.resize(200, 32)
self.nameLabel.move(20, 20)
pybutton = QPushButton('OK', self)
pybutton.clicked.connect(self.second_wind) #connect button to open second window
pybutton.clicked.connect(self.clickMethod)
pybutton.resize(200,32)
pybutton.move(80, 60)
def clickMethod(self):
value =self.line.text() #take value from the line edit
return value
def second_wind(self): #object from secod_window class
self.SW = Second_Window()
self.SW.show()
class Second_Window(QMainWindow):
def __init__(self):
QMainWindow.__init__(self)
self.setMinimumSize(QSize(320, 140))
self.setWindowTitle("Second Window")
self.nameLabel = QLabel(self)
self.nameLabel.setText('Name:')
self.line = QLineEdit(self)
self.line.move(80, 20)
self.line.resize(200, 32)
self.nameLabel.move(20, 20)
self.f = MainWindow() #make object from MainWindow class to execute clickMethod() to reutrn value
a=self.f.clickMethod()
print(a)
if __name__ == "__main__":
app = QtWidgets.QApplication(sys.argv)
mainWin = MainWindow()
mainWin.show()
sys.exit( app.exec_() )
I expect the Clickmethod to return the value
but it returns nothing

Answer 1

Try it:
import sys
from PyQt5 import QtCore, QtWidgets
from PyQt5.QtWidgets import QMainWindow, QWidget, QLabel, QLineEdit
from PyQt5.QtWidgets import QPushButton
from PyQt5.QtCore import QSize
class MainWindow(QMainWindow):
def __init__(self):
QMainWindow.__init__(self)
self.setMinimumSize(QSize(320, 140))
self.setWindowTitle("First Window")
self.nameLabel = QLabel(self)
self.nameLabel.setText('1st:')
self.line = QLineEdit(self)
self.line.move(80, 20)
self.line.resize(200, 32)
self.nameLabel.move(20, 20)
pybutton = QPushButton('OK', self)
pybutton.clicked.connect(self.second_wind)
# pybutton.clicked.connect(self.clickMethod)
pybutton.resize(200,32)
pybutton.move(80, 60)
# def clickMethod(self):
# value =self.line.text()
# return value
def second_wind(self):
text = self.line.text() # +++
self.SW = Second_Window(text) # +++ (text)
self.SW.show()
class Second_Window(QMainWindow):
def __init__(self, text): # +++ (text)
QMainWindow.__init__(self)
self.text = text # +
self.setMinimumSize(QSize(320, 140))
self.setWindowTitle("Second Window")
self.nameLabel = QLabel(self)
self.nameLabel.setText('Name:')
self.line = QLineEdit(self)
self.line.move(80, 20)
self.line.resize(200, 32)
self.nameLabel.move(20, 20)
# self.f = MainWindow()
# a=self.f.clickMethod()
self.line.setText(self.text) # +
print(self.text)
if __name__ == "__main__":
app = QtWidgets.QApplication(sys.argv)
mainWin = MainWindow()
mainWin.show()
sys.exit( app.exec_() )