The new case_when method in Pandas 2.2.0
Pandas 2.2.0 includes a new method, case_when. What is it, and how can you use it? I give an overview, with a number of examples.
Note: In my excitement to get this video done, I showed a different example than I had planned for passing a method; the call to str.contains returns a boolean series, and isn't actually a callable.
Here's a simple example of passing a callable, albeit not the most interesting one:
s.case_when(caselist=[(lambda s_: s_.lt(500), 'low'),
(lambda s_: s_.ge(500), 'high')])
The conditions here are lambdas (aka anonymous functions) that are invoked by case_when, rather than boolean series.
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