Python common built-in modules

Collections:

Collections is a python built-in collection module that provides a number of useful collection classes.

Namedtuple	It is used to create a custom tuple object and to specify the tuple number of elements, and an element that can be referenced with a property instead of an index tuple
Deque	Deque is a two-way list for efficient insert and delete operations, suitable for use in queues and stacks
Defaultdict	Return default value If key does not exist, no error
Ordereddict	Keep Key in order
Counter	A simple counter

Python common built-in modules