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-rw-r--r--Doc/library/stdtypes.rst3
1 files changed, 3 insertions, 0 deletions
diff --git a/Doc/library/stdtypes.rst b/Doc/library/stdtypes.rst
index 8c11c1b..6635b0e 100644
--- a/Doc/library/stdtypes.rst
+++ b/Doc/library/stdtypes.rst
@@ -1149,6 +1149,9 @@ application).
fail, the entire sort operation will fail (and the list will likely be left
in a partially modified state).
+ :meth:`sort` accepts two arguments that can only be passed by keyword
+ (:ref:`keyword-only arguments <keyword-only_parameter>`):
+
*key* specifies a function of one argument that is used to extract a
comparison key from each list element (for example, ``key=str.lower``).
The key corresponding to each item in the list is calculated once and