It is more Pythonic to use the calendar module:
>>> import calendar
>>> list(calendar.day_name)
['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday', 'Sunday']
Or, you can use common day name abbreviations:
>>> list(calendar.day_abbr)
['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
Then index as you wish:
>>> calendar.day_name[1]
'Tuesday'
(If Monday is not the first day of the week, use setfirstweekday to change it)
Using the calendar module has the advantage of being location aware:
>>> import locale
>>> locale.setlocale(locale.LC_ALL, 'de_DE')
'de_DE'
>>> list(calendar.day_name)
['Montag', 'Dienstag', 'Mittwoch', 'Donnerstag', 'Freitag', 'Samstag', 'Sonntag']
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