I had a problem with calendar.formatmonth()
Error message was 'Unsupported Locale'

Well, it seems that Windows (XP) does nothing accept to setlocale than ''

I changed /lib/calendar.py line 488 ff to
class different_locale:
    def __init__(self, locale):
        self.locale = locale

    def __enter__(self):
        _locale.setlocale(_locale.LC_TIME, '') # juebo
        self.oldlocale = _locale.getlocale(_locale.LC_TIME)
        # _locale.setlocale(_locale.LC_TIME, self.locale) # juebo

    def __exit__(self, *args):
        # _locale.setlocale(_locale.LC_TIME, self.oldlocale) #juebo
        _locale.setlocale(_locale.LC_TIME, '')

Well, I am absolute new to Python. So could anybody look over it