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Sorting a Python Dictionary: Values, Keys, and More

  • Sorting a Python dictionary involves organizing its key-value pairs in a specific order.
  • To sort a Python dictionary by its keys, use the sorted() function combined with .items().
  • Sorting by values requires specifying a sort key using a lambda function or itemgetter().
  • You can sort a Python dictionary in descending order by setting the reverse argument of the sorted() function to True.
  • For non-comparable keys or values, you use default values or custom sort keys.
  • Python dictionaries can’t be sorted in-place, so you need to create a new sorted dictionary.
  • Before Python 3.6, dictionaries were inherently unordered.
  • An essential point to understand when sorting dictionaries is that even though they conserve insertion order, they’re not considered a sequence.
  • Because dictionaries don’t have much reordering functionality, when sorting a dictionary, it’s rarely done in-place.
  • The typical method for sorting dictionaries is to get a dictionary view, sort it, and then cast the resulting list back into a dictionary.

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