Reshaping with the stack/unstack methods is far easier when each axis (index/column) level has a name. Pandas allows users to reference each axis level by integer location or by name. Since integer location is implicit and not explicit, you should consider using level names whenever possible. This advice follows from The Zen of Python (http://bit.ly/2xE83uC), a short list of guiding principles for Python of which the second one is Explicit is better than implicit.
Renaming axis levels for easy reshaping
Getting ready
When grouping or aggregating with multiple columns, the resulting pandas object will have multiple levels in one or both of the axes. In this recipe, we will name each level of each axis and then use the methods...
