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Python's Collections Module: defaultdict

Kathan Vakharia
DS-Algo Tenderfoot | Computer Scientist | Aspiring Gopher | DataScience Enthusiast | Python & C++ 💕
・1 min read

Introduction

It won't surprise you if I tell you it is also a dict subclass :)

defaultdict container type eliminates the chances to get KeyErrors in case of normal dictionaries while accessing non existent keys.
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Let's see how defaultdict works,

Importing defaultdict

Importing defaultdict is same as in case of Counter , just make sure about the capitalization.
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Before, we move ahead don't forget it is a dictionary internally so we can leverage all the methods of built-in dict class.

Using defaultdict to provide default values for non-existent keys

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We can simplify the above process using a lambda function.
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🦜 Moreover, we can also pass the builtin constructor functions as default_factory argument.

Here, I have passed list which means the default value for any key will be output of list() ➡️ empty list
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And that's all for the defaultdict container. I hope you are enjoying the series :) If so, leave a like and please comment down below if I've commited any mistake(s)!

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