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Learning pandas - Second Edition by Michael Heydt

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Alignment via index labels

Alignment of Series data by index labels is a fundamental concept in pandas, as well as being one of its most powerful concepts. Alignment provides automatic correlation of related values in multiple Series objects based upon index labels. This saves a lot of error-prone effort matching data in multiple sets using standard procedural techniques.

To demonstrate alignment, let's perform an example of adding values in two Series objects. Let's start with the following two Series objects representing two different samples of a set of variables (a and b):

Now suppose we would like to total the values for each variable. ...

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