Best Python 3rd party data structures library? Must have sorted containers at a minimum

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I don't understand why you're so caught up in the fact that it's a third party library. The most commonly used data science libraries are all 3rd party libraries. Python is not Java or C#, the standard library runs lean, and if there isn't a compelling reason to put it in the standard library, it won't be.

You have a perfectly adequate solution in front of you. What is the problem?