pyqt5日历控件(在固定日期上双击让休日字体颜色变为黑体，再次双击让日历上的黑色字体再次变为红色，退出程序，再次启动时，会显示上次的操作的结果)

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'Calendar1.ui'
#
# Created by: PyQt5 UI code generator 5.11.3
#
# WARNING! All changes made in this file will be lost!
import sys
from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_MainWindow(object):

    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(800, 667)
        MainWindow.setUnifiedTitleAndToolBarOnMac(True)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.calendarWidget = QtWidgets.QCalendarWidget(self.centralwidget)
        self.workless_day_fn = None
        self.workless_date_list = []
        self.workless_day_read_path = "workless_day.txt"
        # self.calendarWidget.clicked.connect(self.single_click)  # 关联单击事件
        self.calendarWidget.activated.connect(self.double_click)  # 关联双击事件
        self.calendarWidget.setGeometry(QtCore.QRect(60, 60, 481, 451))
        self.calendarWidget.setFirstDayOfWeek(QtCore.Qt.Sunday)
        self.calendarWidget.setGridVisible(True)
        self.calendarWidget.setHorizontalHeaderFormat(QtWidgets.QCalendarWidget.LongDayNames)
        self.calendarWidget.setVerticalHeaderFormat(QtWidgets.QCalendarWidget.NoVerticalHeader)
        self.calendarWidget.setNavigationBarVisible(True)
        self.calendarWidget.setDateEditEnabled(True)
        self.calendarWidget.setDateEditAcceptDelay(1500)
        self.calendarWidget.setObjectName("calendarWidget")
        MainWindow.setCentralWidget(self.centralwidget)
        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

        self.set_to_red_or_black()

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "Calender"))

    def double_click(self):
        date = self.calendarWidget.selectedDate()  # 获取当前被选中的日期
        date_str = str(date.toPyDate())
        if date_str in self.workless_date_list:
            self.set_to_blank()
            self.workless_date_list.remove(date_str)
        else:
            self.set_to_red()
            self.workless_date_list.append(date_str)
        self.workless_day_write()

    def workless_day_read(self):
        try:
            self.workless_day_fn = open(self.workless_day_read_path, "r+")
            for line in self.workless_day_fn.readlines():
                if (line.strip("
") not in self.workless_date_list):
                    self.workless_date_list.append(line.strip("
"))
        except:
            self.workless_day_write()
        self.workless_day_fn.close()

    def workless_day_write(self):
        self.workless_day_fn = open(self.workless_day_read_path, "w")
        for i in range(len(self.workless_date_list)):
            self.workless_day_fn.write("{}
".format(self.workless_date_list[i]))
        self.workless_day_fn.close()

    def set_to_red(self):  # 设置颜色为红色
        cmd_fmt = QtGui.QTextCharFormat()
        brush = QtGui.QBrush()
        brush.setColor(QtGui.QColor('Red'))

        cmd_fmt.setForeground(brush)
        self.calendarWidget.setDateTextFormat(self.calendarWidget.selectedDate(), cmd_fmt)

    def set_to_blank(self):  # 去掉背景色
        cmd_fmt = QtGui.QTextCharFormat()
        brush = QtGui.QBrush()
        brush.setColor(QtGui.QColor('Black'))
        cmd_fmt.setForeground(brush)
        self.calendarWidget.setDateTextFormat(self.calendarWidget.selectedDate(), cmd_fmt)

    def set_to_red_or_black(self):#再次启动程序是对日历控件修改
        first_day = QtCore.QDate()
        first_day.setDate(self.calendarWidget.yearShown(), self.calendarWidget.monthShown(), 1)
        days = first_day.daysInMonth()
        cmd_fmt = QtGui.QTextCharFormat()
        brush = QtGui.QBrush()
        for i in range(days):
            self.workless_day_read()
            date_str = str(first_day.addDays(i).toPyDate())
            if date_str in self.workless_date_list:
                brush.setColor(QtGui.QColor('Red'))
                cmd_fmt.setForeground(brush)
                self.calendarWidget.setDateTextFormat(first_day.addDays(i), cmd_fmt)


if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow()  # 生成类实例对象
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())