Make an HTML calendar in a Notebook and highlight some days...

jupyter_calendar.py

# intended for use in a Jupyter Notebook or similar.
import calendar
from calendar import HTMLCalendar
from IPython.display import HTML

# Based on https://stackoverflow.com/a/1458077/1639671
class HighlightedCalendar(HTMLCalendar):
    def __init__(self, highlight=[], *args, **kwargs):
        super().__init__(*args, **kwargs)
        self._highlight = highlight
    
    def formatday(self, day, weekday):
        """
        Return a day as a table cell.
        """
        if day in self._highlight:
            return '<td class="%s" bgcolor="pink">%d</td>' % (self.cssclasses[weekday], day)
        else:
            return super().formatday(day, weekday)
            
highlight = range(1, 7)

HTML(HighlightedCalendar(highlight=highlight).formatmonth(2018, 11))

Great work! Super helpful...