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__Post_init__: Add Attributes To A Dataclass Object Post Initialization
After initializing a class object, we often create derived attributes from existing variables.
To do this in dataclasses, you can use the __𝐩𝐨𝐬𝐭_𝐢𝐧𝐢𝐭__ method. As the name suggests, this method is invoked right after the __𝐢𝐧𝐢𝐭__ method.
This is useful if you need to perform additional setups on your dataclass instance.
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