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| author | Raymond Hettinger <python@rcn.com> | 2016-04-26 07:59:16 (GMT) |
|---|---|---|
| committer | Raymond Hettinger <python@rcn.com> | 2016-04-26 07:59:16 (GMT) |
| commit | 167c81d5ed5a56a6f05a0786db483b2b73a55a45 (patch) | |
| tree | eb15a50a92f26dc5812aa3592c6c19505cf79ba7 | |
| parent | b31c87bfcfc8b904ef05d998b4c38122b8651763 (diff) | |
| download | cpython-167c81d5ed5a56a6f05a0786db483b2b73a55a45.zip cpython-167c81d5ed5a56a6f05a0786db483b2b73a55a45.tar.gz cpython-167c81d5ed5a56a6f05a0786db483b2b73a55a45.tar.bz2 | |
Issue #23986: Note that the in-operator for lists and tuples check identity before equality.
| -rw-r--r-- | Doc/reference/expressions.rst | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/Doc/reference/expressions.rst b/Doc/reference/expressions.rst index 1fd37f3..c46ab64 100644 --- a/Doc/reference/expressions.rst +++ b/Doc/reference/expressions.rst @@ -1153,7 +1153,7 @@ types to support membership tests without being a sequence. In particular, dictionaries (for keys) and sets support membership testing. For the list and tuple types, ``x in y`` is true if and only if there exists an -index *i* such that ``x == y[i]`` is true. +index *i* such that either ``x is y[i]`` or ``x == y[i]`` is true. For the Unicode and string types, ``x in y`` is true if and only if *x* is a substring of *y*. An equivalent test is ``y.find(x) != -1``. Note, *x* and *y* |