PyQt5 QPushButton Problem

[Hellmut]

Hello everybody!

I am working on my homework and I have a problem with QPushButtons. I need to make a field(8*8) of QPushButtons and then work with every button seperately. For example, if I click on button, I want it to turn red, but in my code it works only for last button. I know that it probably has simply solution, but I am beginner and I have already spent quite long time on that. Thans for ideas :D

from PyQt5.QtWidgets import *

class MainWindow(QWidget):
def __init__(self):
super().__init__()
self.resize(100,300)
layout = QGridLayout()
for x in range(8):
for y in range(8):
self.buttons = QPushButton(self)
layout.addWidget(self.buttons,x,y)
self.setLayout(layout)
self.buttons.clicked.connect(self.flag)
def flag(self):
self.buttons.setStyleSheet("background-color : red")

if __name__ == '__main__':
app = QApplication([])
window = MainWindow()
window.show()
app.exec()

[deanhystad]

It is hard to tell because of the indentation. I am assuming your code looks like this:

from PySide2.QtWidgets import *
class MainWindow(QWidget):
    def __init__(self):
        super().__init__()
        self.resize(100,300)
        layout = QGridLayout()
        for x in range(8):
            for y in range(8):
                self.buttons = QPushButton(self)
                layout.addWidget(self.buttons,x,y)
        self.setLayout(layout)
        self.buttons.clicked.connect(self.flag)

    def flag(self):
        self.buttons.setStyleSheet("background-color : red")

if __name__ == '__main__':
    app = QApplication([])
    window = MainWindow()
    window.show()
    app.exec()

The problem with this code is that only the last button is bound to the "clicked" signal. None of the other buttons have anything to do when pressed.

You need to bind all the buttons to the callback signal. But the obvious solution below does not work.

from PySide2.QtWidgets import *

class MainWindow(QWidget):
    def __init__(self):
        super().__init__()
        self.resize(100,300)
        layout = QGridLayout()
        self.setLayout(layout)
        for x in range(8):
            for y in range(8):
                self.buttons = QPushButton(self)
                layout.addWidget(self.buttons,x,y)
                self.buttons.clicked.connect(self.flag)

    def flag(self):
        self.buttons.setStyleSheet("background-color : red")

if __name__ == '__main__':
    app = QApplication([])
    window = MainWindow()
    window.show()
    app.exec()

Now clicking any button calls flag(), but flag only knows about the very last button. The only button saved as an attribute of MainWindow().

What you need to do is somehow tell the callback flag() about which button was pressed. You should do a little research on lambda functions and functools.partial.

[Hellmut]

Thanks a lot for reply and help man!
I will try to figure it out :D