class datetime.tzinfo This is an abstract base class, meaning that this class should not be instantiated directly. You need

timezone.dst(dt) Always returns None.

class datetime.timezone(offset[, name]) The offset argument must be specified as a timedelta object representing

weakref.ProxyTypes Sequence containing all the type objects for proxies. This can make it simpler to test if an object is a

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

class collections.abc.Generator ABC for generator classes that implement the protocol defined in

extend(iterable) Extend the right side of the deque by appending elements from the iterable argument.

itermonthdates(year, month) Return an iterator for the month month (1-12) in the year year. This iterator

heapq.merge(*iterables, key=None, reverse=False) Merge multiple sorted inputs into a single sorted output (for example, merge

WeakKeyDictionary.keyrefs() Return an iterable of the weak references to the keys.