Maybe, knowing Python internals is not a thing you should know to be a good Python developer. However, if you want to improve your code it becomes more important. If you know it works under the hood, you write a code with less stupid mistakes and architecture issues.

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A couple of weeks ago one of my colleagues ask if Python function is possible to use as a key in dicts? Yes, it is. So, every function has a hash. But how is it calculated? Based on function name? Based on function byte code? Actually, it calculates by transforming a pointer to a function object. However, it is not so easy to find it in the CPython code.

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