[FIXED] PyQt5: QCalendarWidget reset font of a de-selected date

Issue

I've created a calendar widget with its styleSheet, current date text format and set up date selection via .clicked function.

#setting up calendar
self.dateWidget = QCalendarWidget()

#setting up current date font format (on the app start)
self.painter = QTextCharFormat()
self.painter.setFont(QFont("Times", 20, 200))
self.dateWidget.setDateTextFormat(self.dateWidget.selectedDate(), self.painter)
    
#selecting current date on the app start, then connecting event for changing the date on click.
self.date = self.dateWidget.selectedDate()                      
self.dateWidget.clicked[QDate].connect(self.ChooseDate)

def ChooseDate(self, clicked=""):
    self.dateWidget.setDateTextFormat(clicked, self.painter)
    self.date = arrow.get(clicked.year(), clicked.month(), clicked.day())
    print(f'{self.date}: {self.time}')

When some date is clicked, its font gets modified.

But when another date is clicked, the previous date's font stays modified. How do I reset the font of a de-selected (previous) date back to default - at the same time leaving the font of the TODAY date (which style is applied on app start) the same (increased)?

Pic.1 - Current date, selected on app start.

Pic.2 - Some date clicked. TODAY date (22nd) must stay as it is.

Pic.3 - Another date clicked. TODAY date (22nd) must stay as it is, but 24th must be reset to default.

Solution

One way to achieve what you want is to clear the current formatting by setting a null date:

    self.painter = QTextCharFormat()
    self.painter.setFont(QFont("Times", 20, 200))
    self.dateWidget.clicked[QDate].connect(self.ChooseDate)
    self.ChooseDate()

def ChooseDate(self, clicked=None):
    # clear the current formatting first
    self.dateWidget.setDateTextFormat(QDate(), self.painter)
    # then reset the current and selected dates
    self.dateWidget.setDateTextFormat(QDate.currentDate(), self.painter)
    if clicked is not None:
        self.dateWidget.setDateTextFormat(clicked, self.painter)
        self.date = arrow.get(clicked.year(), clicked.month(), clicked.day())
        print(f'{self.date}: {self.time}')
    else:
        self.date = QDate.currentDate()

Answered By - ekhumoro