PyQt5 QCalendarWidget - Add border to a QWidget child

PyQt5 is a Python library that lets you create desktop applications that is compatible with Windows, MacOS, and Linux. QCalendarWidget is a widget to display a calendar, and in this tutorial, we will show you how to add a border to a QWidget child in QCalendarWidget.

Requirements

• PyQt5

Example Code

from PyQt5.QtWidgets import QApplication, QCalendarWidget, QVBoxLayout, QWidget
from PyQt5.QtCore import Qt


class Calendar(QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        self.cal = QCalendarWidget(self)
        self.cal.setGridVisible(True)
        self.cal.setGeometry(0, 0, 250, 250)

        layout = QVBoxLayout()
        layout.addWidget(self.cal)
        self.setLayout(layout)

        self.setStyleSheet("""QWidget { 
                                border: 2px solid black;
                                border-radius: 10px;
                                padding: 5px;
                            }""")


if __name__ == '__main__':
    app = QApplication([])
    window = Calendar()
    window.show()
    app.exec_()

Explanation

The Calendar widget contains a QCalendarWidget as its child, and the stylesheet applied to self affects its child as well. The stylesheet sets a 2-pixel-wide solid black border with a 10-pixel border radius and 5-pixel padding on all sides.

By default, the border is applied to the entire widget, which doesn't look very nice since the QCalendarWidget already has some padding and border built-in. Therefore, we specify that the border is only for the top-level QWidget by using the QWidget selector.

In addition, setting the border-radius property gives the border rounded corners, which is a nice visual touch.

Conclusion

By following this tutorial, you have learned how to add a border to a QWidget child in QCalendarWidget using PyQt5. This is just one example of the many customizations you can do with PyQt5's stylesheet feature.