The modules described in this chapter provide a variety of specialized data types such as dates and times, fixed-type arrays, heap queues, synchronized queues, and sets.
Python also provides some built-in data types, in particular, :class:`dict`, :class:`list`, :class:`set` and :class:`frozenset`, and :class:`tuple`. The :class:`str` class is used to hold Unicode strings, and the :class:`bytes` class is used to hold binary data.
The following modules are documented in this chapter:
.. toctree:: datetime.rst calendar.rst collections.rst collections.abc.rst heapq.rst bisect.rst array.rst weakref.rst types.rst copy.rst pprint.rst reprlib.rst enum.rst