Sort list in Python using key

  An Example of sorting list in Python using key

  >>> l = ['aa','aaa','aaaa','b','bb','z','ccc']
  >>> sort_key = lambda s: (-len(s), s)
  >>> l.sort(key=sort_key)
  >>> l
  ['aaaa', 'aaa', 'ccc', 'aa', 'bb', 'b', 'z']

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