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Rsplit method

As explained in Pandas Workout: 200 exercises to make you a stronger data analyst

str.rsplit is a Python string method that splits a string from the right using a specified separator and maximum number of splits.

Python’s str.rsplit method splits a string from the right. Supplying a separator and a maximum split count controls where the result is divided. section 8.2

Split a dotted column name

s = 'abcd.efgh.ijkl'\ns.rsplit('.', 1)\n# ['abcd.efgh', 'ijkl']\n\nWith a maximum of 1, the final period separates the column’s category from its final name. Unpacking the result into first and rest produces a tuple suitable for pandas.MultiIndex.from_tuples. section 8.2

How Pandas Workout: 200 exercises to make you a stronger data analyst covers it

How deep it goes
Defines right-side splitting and demonstrates one controlled split, stopping short of a broader API catalog.
Examples
Uses the string 'abcd.efgh.ijkl' and dotted survey column names such as 'ide.main'.
What it assumes
Assumes basic Python strings and unpacking while demonstrating the method through a concrete pandas column-naming task.
What you can do after
Apply via Python’s str.rsplit to separate the final dotted component while preserving the preceding text.
How it connects
Connects string splitting with tuple construction, list comprehensions, and pandas MultiIndex.
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