18 - Python Collections Arrays

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Collections is a built-in Python module that implements specialized container datatypes providing alternatives to Python's general purpose built-in containers such as dict , list , set , and tuple

Collections in Python are containers used for storing data and are commonly known as data structures, such as lists, tuples, arrays, dictionaries, etc.

Python has a built-in collections module providing additional data structures for collections of data

Defaultdict is exactly like a dictionary in python. The only difference is that it does not give an exception/key error when you try to access the non-existent key.

In the following code, even though the 4th index was not initialized, the compiler still returns a value, 0, when we try to access it.