Commitd1239f7

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Add test and news entry

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Lines changed: 22 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -268,6 +268,28 @@ def loop():`
`268`	`268`	`#This should not raise`
`269`	`269`	`loop()`
`270`	`270`
	`271`	`+deftest_genexpr_only_calls_dunder_iter_once(self):`
	`272`	`+`
	`273`	`+classIterator:`
	`274`	`+`
	`275`	`+def__init__(self):`
	`276`	`+self.val=0`
	`277`	`+`
	`278`	`+def__next__(self):`
	`279`	`+ifself.val==2:`
	`280`	`+raiseStopIteration`
	`281`	`+self.val+=1`
	`282`	`+returnself.val`
	`283`	`+`
	`284`	`+# No __iter__ method`
	`285`	`+`
	`286`	`+classC:`
	`287`	`+`
	`288`	`+def__iter__(self):`
	`289`	`+returnIterator()`
	`290`	`+`
	`291`	`+self.assertEqual([1,2],list(iforiinC()))`
	`292`	`+`
`271`	`293`
`272`	`294`	`classModifyUnderlyingIterableTest(unittest.TestCase):`
`273`	`295`	`iterables= [`

Lines changed: 4 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,4 @@`
	`1`	+No longer call ``__iter__`` twice when creating and executing a generator
	`2`	`+expression. Creating a generator expression with non-interable will only`
	`3`	`+raise when the generator expression is exeuted. This brings the behavior of`
	`4`	`+generator expressions in line with other generators`

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