[Python] How to remove margins from inside a QWidget (or around QLabel)

I have an undeletable remaining margin (or padding?) somewhere between a QWidget and it QLabel child. As you can see in the following rendering:



And this is my MWE:

import sys
import alsaaudio
from PyQt6.QtWidgets import QWidget, QLabel, QHBoxLayout, QApplication, QSizePolicy
from PyQt6.QtCore import QTimer, Qt


class VolumeWidget(QWidget):
def __init__(self):
super().__init__()

# Label
self.symbol_label = QLabel()
self.symbol_label.setText("test")
self.symbol_label.setContentsMargins(0, 0, 0, 0)
self.symbol_label.setSizePolicy(QSizePolicy.Policy.Fixed, QSizePolicy.Policy.Fixed)
self.symbol_label.setObjectName("symbol")

# Style CSS
self.setStyleSheet("""
* {
margin: 0; padding: 0;
}
QHBoxLayout {
background-color: blue;
margin: 0; padding: 0;
}
QWidget {
background-color: green;
font-size: 18px;
margin: 0; padding: 0;
}
QLabel#symbol {
background-color: blue;
margin: 0; padding: 0;
}
QHBoxLayout {
background-color: yellow;
margin: 0; padding: 0;
}
""")


# Layout
layout = QHBoxLayout()
layout.addWidget(self.symbol_label)
layout.setContentsMargins(0, 0, 0, 0)
layout.setSpacing(0)
self.setLayout(layout)


# Last widget tuning
self.adjustSize()
self.setContentsMargins(0, 0, 0, 0)


if __name__ == "__main__":
app = QApplication(sys.argv)
widget = VolumeWidget()
widget.show()
sys.exit(app.exec())

What I tried


As you can see, I depload many tactics to resolve this problem.

1. I tried setContentsMargins(0, 0, 0, 0) method in each the widget itself, the label, and the layout ;
2. I tried setSpacing(0) method in the layout ;
3. I tried many thing with margin: 0; padding: 0; inside the CSS ;
4. I tried adjustSize() on the widget ;
5. I tried all this things at the same time. And as you see, the margin remain and seems not resizable to a lower dimensions

Question


What to do to remove definitely this margins?

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