Highlighting today's date in python using calendar.py in command prompt/windows powershell

Question

I ran the following .py file using window's command prompt.

def main():
import calendar
from datetime import date
import time

# Converting 'datetime.date object to a string'
today=str(date.today())
# Generating a list of string like ['2021', '02', '02']
today=today.split("-")
#Converting string to integer
year=int(today[0])
month=int(today[1])
date=int(today[2])
print(calendar.month(year,month))

if __name__ == "__main__":
main()

It gave me the following output.

If I wanted to highlight today's date in windows command prompt like shown below, what would I have to do?

Answer 1

You can apply Console Virtual Terminal Sequences, e.g. as follows:

from datetime import date
import calendar
import time
import re

today = date.today()
year  = today.year
month = today.month
thism = calendar.month(year,month)    # current month
date  = today.day.__str__().rjust(2)
rday  = ('\\b' + date + '\\b').replace('\\b ', '\\s')
rdayc = "\033[7m" + date + "\033[0m"
#             7 Swaps foreground and background colors
print( re.sub(rday,rdayc,thism))

Works from cmd, powershell and pwsh regardless if run under conhost.exe or from Windows Terminal:

Answer 2

I used @JosefZ's answer and introduced a subclass of the TextCalendar:

import calendar
from datetime import datetime

today = datetime.today()
year = today.year
month = today.month
day = today.day


class DayInMonthHighlightingCalendar(calendar.TextCalendar):
    def __init__(self, day_to_highlight=-1):
        super().__init__()
        self._day_to_highlight = day_to_highlight

    def formatday(self, day: int, weekday: int, width: int) -> str:
        s = super().formatday(day, weekday, width)
        if day == self._day_to_highlight:
            s = f"\033[7m{s}\033[0m"
        return s


print(DayInMonthHighlightingCalendar(day_to_highlight=day).formatmonth(year, month))

The final effect is the same, but the code structure should be a bit clearer.