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#1410739: add a footnote about "is" and "unusual" behavior.

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Georg Brandl 2008-07-01 20:50:02 +00:00
parent 1e0eefc4a1
commit 3214a01d27
1 changed files with 5 additions and 1 deletions
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Doc/reference/expressions.rst
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@ -1113,7 +1113,7 @@ The operator :keyword:`not in` is defined to have the inverse true value of
The operators :keyword:`is` and :keyword:`is not` test for object identity: ``x The operators :keyword:`is` and :keyword:`is not` test for object identity: ``x
is y`` is true if and only if *x* and *y* are the same object. ``x is not y`` is y`` is true if and only if *x* and *y* are the same object. ``x is not y``
yields the inverse truth value. yields the inverse truth value. [#]_
.. _booleans: .. _booleans:
@ -1352,3 +1352,7 @@ groups from right to left).
only, but this caused surprises because people expected to be able to test a only, but this caused surprises because people expected to be able to test a
dictionary for emptiness by comparing it to ``{}``. dictionary for emptiness by comparing it to ``{}``.
.. [#] Due to automatic garbage-collection, free lists, and the dynamic nature of
descriptors, you may notice seemingly unusual behaviour in certain uses of
the :keyword:`is` operator, like those involving comparisons between instance
methods, or constants. Check their documentation for more info.