class collections.defaultdict([default_factory[, ...]]) Returns a new dictionary-like object. defaultdict is a

heapq.heappush(heap, item) Push the value item onto the heap, maintaining the heap invariant.

class collections.abc.MutableSequence class collections.abc.ByteString ABCs for read-only and mutable

reverse() Reverse the elements of the deque in-place and then return None.

date.isocalendar() Return a 3-tuple, (ISO year, ISO week number, ISO weekday). The ISO calendar

timezone.utc The UTC timezone, timezone(timedelta(0)).

datetime.minute In range(60).

Repr.maxdict Repr.maxlist Repr.maxtuple Repr.maxset

class collections.UserString([sequence]) Class that simulates a string or a Unicode string object. The instance’s content is

pryear(theyear, w=2, l=1, c=6, m=3) Print the calendar for an entire year as returned by formatyear().