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Third time trying to commit the new pronouncement about set literals. :-( 

Also mention removing __mod__ and __divmod__ from float.
This commit is contained in:
Guido van Rossum 2006-05-04 18:15:10 +00:00
parent 10535b0182
commit d487898001
1 changed files with 10 additions and 3 deletions
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13
pep-3100.txt
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@ -104,12 +104,12 @@ Core language
and semantics is evil. and semantics is evil.
* Attributes on functions of the form ``func_whatever`` will be renamed * Attributes on functions of the form ``func_whatever`` will be renamed
``__whatever__`` [25]_ ``__whatever__`` [25]_
* Set literals and comprehensions [27]_ * Set literals and comprehensions [27]_ [28]_
{/} means set(); {x} means set([x]); {x, y} means set([x, y]). {x} means set([x]); {x, y} means set([x, y]).
{F(x) for x in S if P(x)} means set(F(x) for x in S if P(x)). {F(x) for x in S if P(x)} means set(F(x) for x in S if P(x)).
NB. {range(x)} means set([range(x)]), NOT set(range(x)). NB. {range(x)} means set([range(x)]), NOT set(range(x)).
There's no literal for an empty set; use set() (or {1}&{2} :-).
There's no frozenset literal; they are too rarely needed. There's no frozenset literal; they are too rarely needed.
The {/} part is still controversial.
To be removed: To be removed:
@ -117,6 +117,7 @@ To be removed:
* ``raise Exception, "message"``: use ``raise Exception("message")`` [14]_ * ``raise Exception, "message"``: use ``raise Exception("message")`` [14]_
* ```x```: use ``repr(x)`` [2]_ * ```x```: use ``repr(x)`` [2]_
* The ``<>`` operator: use ``!=`` instead [3]_ * The ``<>`` operator: use ``!=`` instead [3]_
* The __mod__ and __divmod__ special methods on float. [29]_
* Unbound methods [7]_ * Unbound methods [7]_
* METH_OLDARGS, WITH_CYCLE_GC * METH_OLDARGS, WITH_CYCLE_GC
* __getslice__, __setslice__, __delslice__ [17]_ * __getslice__, __setslice__, __delslice__ [17]_
@ -317,6 +318,12 @@ References
.. [27] python-3000 email ("sets in P3K?") .. [27] python-3000 email ("sets in P3K?")
http://mail.python.org/pipermail/python-3000/2006-April/001286.html http://mail.python.org/pipermail/python-3000/2006-April/001286.html
[28] python-3000 email ("sets in P3K?")
http://mail.python.org/pipermail/python-3000/2006-May/001666.html
[29] python-3000 email ("bug in modulus?")
http://mail.python.org/pipermail/python-3000/2006-May/001735.html
.. [#pep238] PEP 238 (Changing the Division Operator) .. [#pep238] PEP 238 (Changing the Division Operator)
http://www.python.org/dev/peps/pep-0238 http://www.python.org/dev/peps/pep-0238