class collections.abc.Set class collections.abc.MutableSet ABCs for read-only and mutable sets.

@reprlib.recursive_repr(fillvalue="...") Decorator for __repr__() methods to detect recursive calls within the

popleft() Remove and return an element from the left side of the deque. If no elements are present, raises an

class calendar.LocaleTextCalendar(firstweekday=0, locale=None) This subclass of TextCalendar can be passed a locale

appendleft(x) Add x to the left side of the deque.

calendar.setfirstweekday(weekday) Sets the weekday (0 is Monday, 6 is Sunday) to start each week.

exception copy.error Raised for module specific errors.

date.day Between 1 and the number of days in the given month of the given year.

datetime.ctime() Return a string representing the date and time, for example datetime(2002, 12, 4, 20, 30, 40).ctime()

formatyear(theyear, w=2, l=1, c=6, m=3) Return a m-column calendar for an entire year as a multi-line string. Optional