[Python-checkins] r60013 - in python/trunk: Doc/library/itertools.rst Lib/test/test_itertools.py Misc/NEWS Modules/itertoolsmodule.c
raymond.hettinger
python-checkins at python.org
Thu Jan 17 04:02:15 CET 2008
Author: raymond.hettinger
Date: Thu Jan 17 04:02:14 2008
New Revision: 60013
Modified:
python/trunk/Doc/library/itertools.rst
python/trunk/Lib/test/test_itertools.py
python/trunk/Misc/NEWS
python/trunk/Modules/itertoolsmodule.c
Log:
Make starmap() match its pure python definition and accept any itertable input (not just tuples).
Modified: python/trunk/Doc/library/itertools.rst
==============================================================================
--- python/trunk/Doc/library/itertools.rst (original)
+++ python/trunk/Doc/library/itertools.rst Thu Jan 17 04:02:14 2008
@@ -330,17 +330,19 @@
.. function:: starmap(function, iterable)
- Make an iterator that computes the function using arguments tuples obtained from
+ Make an iterator that computes the function using arguments obtained from
the iterable. Used instead of :func:`imap` when argument parameters are already
grouped in tuples from a single iterable (the data has been "pre-zipped"). The
difference between :func:`imap` and :func:`starmap` parallels the distinction
between ``function(a,b)`` and ``function(*c)``. Equivalent to::
def starmap(function, iterable):
- iterable = iter(iterable)
- while True:
- yield function(*iterable.next())
+ for args in iterable:
+ yield function(*args)
+ .. versionchanged:: 2.6
+ Previously, :func:`starmap` required the function arguments to be tuples.
+ Now, any iterable is allowed.
.. function:: takewhile(predicate, iterable)
Modified: python/trunk/Lib/test/test_itertools.py
==============================================================================
--- python/trunk/Lib/test/test_itertools.py (original)
+++ python/trunk/Lib/test/test_itertools.py Thu Jan 17 04:02:14 2008
@@ -292,7 +292,8 @@
self.assertEqual(take(3, starmap(operator.pow, izip(count(), count(1)))),
[0**1, 1**2, 2**3])
self.assertEqual(list(starmap(operator.pow, [])), [])
- self.assertRaises(TypeError, list, starmap(operator.pow, [[4,5]]))
+ self.assertEqual(list(starmap(operator.pow, [iter([4,5])])), [4**5])
+ self.assertRaises(TypeError, list, starmap(operator.pow, [None]))
self.assertRaises(TypeError, starmap)
self.assertRaises(TypeError, starmap, operator.pow, [(4,5)], 'extra')
self.assertRaises(TypeError, starmap(10, [(4,5)]).next)
Modified: python/trunk/Misc/NEWS
==============================================================================
--- python/trunk/Misc/NEWS (original)
+++ python/trunk/Misc/NEWS Thu Jan 17 04:02:14 2008
@@ -993,6 +993,9 @@
the context manager protocol. The _winreg module also gained a new function
``ExpandEnvironmentStrings`` to expand REG_EXPAND_SZ keys.
+- itertools.starmap() now accepts any iterable input. Previously, it required
+ the function inputs to be tuples.
+
- Issue #1646: Make socket support TIPC. The socket module now has support
for TIPC under Linux, see http://tipc.sf.net/ for more information.
Modified: python/trunk/Modules/itertoolsmodule.c
==============================================================================
--- python/trunk/Modules/itertoolsmodule.c (original)
+++ python/trunk/Modules/itertoolsmodule.c Thu Jan 17 04:02:14 2008
@@ -1356,10 +1356,11 @@
if (args == NULL)
return NULL;
if (!PyTuple_CheckExact(args)) {
+ PyObject *newargs = PySequence_Tuple(args);
Py_DECREF(args);
- PyErr_SetString(PyExc_TypeError,
- "iterator must return a tuple");
- return NULL;
+ if (newargs == NULL)
+ return NULL;
+ args = newargs;
}
result = PyObject_Call(lz->func, args, NULL);
Py_DECREF(args);
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