How to add text to PyQt QcalendarWidget

Question

How does one write into the QCalendarWidget cell? In python, I keep getting painter not active message. Can someone help me out with this?

qp = QtGui.QPainter(self)
qp.setPen(QtGui.QColor(168, 34, 3))
qp.setFont(QtGui.QFont('Decorative', 10))
qp.drawText(rect, QtCore.Qt.AlignCenter, 'hello') 

rect = QtCore.QRect()
date = QtCore.QDate.fromString('2020-01-01')
calendar = QtWidgets.QCalendarWidget(self)

calendar.paintCell(qp, rect, date)

thanks

Answer 1

You must inherit from QCalendarWidget and overwrite the paintCell method.

import sys
from PyQt5.QtCore    import Qt, QRectF, QDate
from PyQt5.QtGui     import QPainter, QColor, QFont
from PyQt5.QtWidgets import QCalendarWidget, QApplication

class CalendarWidget(QCalendarWidget):

    def paintCell(self, painter, rect, date):
        painter.setRenderHint(QPainter.Antialiasing, True)
        if date == QDate(2020, 1, 1):
            painter.save()
            painter.drawRect(rect)
            painter.setPen(QColor(168, 34, 3))
            painter.setFont(QFont('Decorative', 10))            
            painter.drawText(QRectF(rect), Qt.TextSingleLine|Qt.AlignCenter, str(date.day()))
            painter.drawText(rect, Qt.AlignCenter, 'Hello\nWorld') 

            painter.restore()
        else:
            QCalendarWidget.paintCell(self, painter, rect, date)

if __name__ == '__main__':
    app = QApplication(sys.argv)
    w = CalendarWidget()
    w.show()
    sys.exit(app.exec_())