Feature or enhancement

In Python 3.13 we added colour output to the new REPL, tracebacks and doctest, and in 3.14 to unittest andtest.regrtest, which can also be controlled with thePYTHON_COLORS,NO_COLOR andFORCE_COLOR environment variables:

• https://docs.python.org/3.14/whatsnew/3.14.html#unittest
• https://docs.python.org/3.14/using/cmdline.html#using-on-controlling-color

On macOS, thecal utility does something similar, but highlights today.

The calendar module has a CLI to print out a calendar to the terminal, but with no highlighting. Let's add it.

Linked PRs

• gh-128317: Highlight today in colour in calendar CLI output #128318
• gh-128317: Documentcalendar.TextCalendar.formatweek #128353
• [3.13] gh-128317: Documentcalendar.TextCalendar.formatweek (GH-128353) #128357
• [3.12] gh-128317: Documentcalendar.TextCalendar.formatweek (GH-128353) #128358
• gh-128317: Move CLI calendar highlighting to private class #129625