Reload stylesheets in PyQT / PySide after change object name

Question

Good day, colleagues, I have a styles, example:

#button_1 {
  background-color: green;
}

#button_2 {
  background-color: red;
}

I have 3 objects:

button_1 = QPushButton()
button_2 = QPushButton()
button_3 = QPushButton()

And I want after click on button_1 set to this button style #button_1, I change the name of this button

button_1.setObjectName('button_1')

but after it button style not change, (but css load correct it's worked), and I have a question, maybe I need to reload or do smth with this button to set this style for it and it should be work.

I use python version 3.10 and pyside6 version 6.4.1

Full code of app:

from PySide6.QtWidgets import QHBoxLayout, QWidget, QPushButton, QApplication
import sys


class App(QWidget):
    

    def __init__(self) -> None:
        super().__init__()
        self.load_ui()

    def load_ui(self):
        self.setStyleSheet("""
                           #button_1 {
                             background-color: green;
                           }

                           #button_2 {
                             background-color: red;
                           }
                           """)

        self.button_1 = QPushButton()
        self.button_2 = QPushButton()
        self.button_3 = QPushButton()

        self.app_layout = QHBoxLayout()

        self.app_layout.addWidget(self.button_1)
        self.app_layout.addWidget(self.button_2)
        self.app_layout.addWidget(self.button_3)

        self.setLayout(self.app_layout)

        self.button_1.clicked.connect(self.button_1_click)

    def button_1_click(self):
        print('clicked')
        self.button_1.setObjectName('button_1')


if __name__ == "__main__":
    app = QApplication(sys.argv)
    main_window_widget = App()    
    main_window_widget.show()
    sys.exit(app.exec_())
 

Answer 1

For correctly work all styles, after change the name I make reload all styles. Example:

In app class I add:

def load_styles(self):
    with open('styles.css', 'r') as file:
        self.setStyleSheet(file.read())

After that, after change the name, I call this method:

def button_1_click(self):
    print('clicked')
    self.button_1.setObjectName('button_1')
    self.load_styles()

Not good solve, but another I doesn't have :(