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Engineering LibreTexts

10.4: Dictionaries and Tuples

  • Page ID
    3173
  • [ "article:topic", "authorname:severancec", "python (language)", "license:ccbyncsa" ]

    Dictionaries have a method called items that returns a list of tuples, where each tuple is a key-value pair:

    >>> d = {'a':10, 'b':1, 'c':22}
    >>> t = list(d.items())
    >>> print(t)
    [('b', 1), ('a', 10), ('c', 22)]

    As you should expect from a dictionary, the items are in no particular order.

    However, since the list of tuples is a list, and tuples are comparable, we can now sort the list of tuples. Converting a dictionary to a list of tuples is a way for us to output the contents of a dictionary sorted by key:

    >>> d = {'a':10, 'b':1, 'c':22}
    >>> t = list(d.items())
    >>> t
    [('b', 1), ('a', 10), ('c', 22)]
    >>> t.sort()
    >>> t
    [('a', 10), ('b', 1), ('c', 22)]

    The new list is sorted in ascending alphabetical order by the key value.