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Showing content from https://realpython.com/lessons/use-categorical-data-save-time-and-space/ below:

Use Categorical Data to Save Time and Space (Video) – Real Python

Did you ever find yourself in the situation, where you wanted to process a larger DataFrame and the operations seem to hang up for more than a few seconds? Then you may want to try out one of pandas powerful features: The Categorical dtype. In this lesson you’ll learn how to make use of the Categorical dtype to save you time and space.

Seems like the to_datetime method which was used to re-index the dataframe in the 5th video was able to parse the YYYY-MM-DD format on its own. Is this explicitly true, or does that method require data to be supplied in that order?

colors = pd.Series([
  'periwinkle',
  'mint green',
  'burnt orange',
  'periwinkle',
  'burnt orange',
  'rose',
  'rose',
  'mint green',
  'rose',
  'navy',
])

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