Айнур Зулькарнаев wrote: > Hello all! > > > There is a class Calendar in calendar.py in standard libriary. > > > class Calendar(object): > """ > Base calendar class. This class doesn't do any formatting. It > simply provides data to subclasses. > """ > > def __init__(self, firstweekday=0): > self.firstweekday = firstweekday # 0 = Monday, 6 = Sunday > > def getfirstweekday(self): > return self._firstweekday % 7 > > def setfirstweekday(self, firstweekday): > self._firstweekday = firstweekday > > firstweekday = property(getfirstweekday, setfirstweekday) > > > As far as I understand, even if user enters inappropriate firstweekday > parameter (bigger than 6) during instansiation of the Calendar, the > Calendar swallows it (and latter returns correct firstweekday value due to > %7 in getfirstweekday method). > > > So, the question is why not explicitly raise ValueError if user enters the > firstweekday parameter bigger that 6 (with accordance with the Zen). Am I > missing something?
It does no harm to those who use the class properly while it allows those unfamiliar with the idea of a 0th day to specify 7 instead 0. The behaviour thus may be interpreted as an example of """Be strict when sending and tolerant when receiving.""" See also https://tools.ietf.org/html/rfc1958 https://en.wikipedia.org/wiki/Robustness_principle _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
