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Python Glossary: terms starting with letter K
By Guest on 13th November 2022 07:37:07 PM | Syntax: PYTHON | Views: 190


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  1. Glossary - K
  2. ********
  3.  
  4. key function
  5.    A key function or collation function is a callable that returns a
  6.    value used for sorting or ordering.  For example,
  7.    "locale.strxfrm()" is used to produce a sort key that is aware of
  8.    locale specific sort conventions.
  9.  
  10.    A number of tools in Python accept key functions to control how
  11.    elements are ordered or grouped.  They include "min()", "max()",
  12.    "sorted()", "list.sort()", "heapq.merge()", "heapq.nsmallest()",
  13.    "heapq.nlargest()", and "itertools.groupby()".
  14.  
  15.    There are several ways to create a key function.  For example. the
  16.    "str.lower()" method can serve as a key function for case
  17.    insensitive sorts.  Alternatively, a key function can be built from
  18.    a "lambda" expression such as "lambda r: (r[0], r[2])".  Also,
  19.    "operator.attrgetter()", "operator.itemgetter()", and
  20.    "operator.methodcaller()" are three key function constructors.  See
  21.    the Sorting HOW TO for examples of how to create and use key
  22.    functions.
  23.  
  24. keyword argument
  25.    See *argument*.
















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