Python Collections

The python defaultdict class is a subclass of dict class, it supports all the functions that dict class provides. But when you provide a key that does not exist in the python dict object, the dict object will return a KeyError. But the defaultdict object provides a default_factory attribute which is a python function and …

Python Defaultdict Example Read More »

The python Counter class in the Collections package is a very useful tool class, which can automatically count the number of occurrences of each element in the container. The essence of Counter is a special python dictionary object, except that its keys are all the elements it contains, and its value records the number of occurrences …

How To Make A Counter In Python Read More »

The python collections.ChainMap class can combine multiple python dictionary objects into one dictionary object, this article will tell you how to use it with some examples.