How do you see the code of predefined (not defined by me) python functions?

How do you see the code of predefined (not defined by me) python functions?

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I wouldn’t want to read through any implementation unless I had to for research/problem solving.

The concept of the languages built in methods is that they are a black box. You needn’t look in and see how it works. You only need to know what data to give it and what it will do with that data.

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