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[Python-ideas] OrderedDict.peekitem()
Chris Angelicorosuav at gmail.com
Tue Jul 7 16:59:54 CEST 2015
On Wed, Jul 8, 2015 at 12:58 AM, Chris Angelico <rosuav at gmail.com> wrote:> On Wed, Jul 8, 2015 at 12:35 AM, Oscar Benjamin> <oscar.j.benjamin at gmail.com> wrote:>> If the OrderedDict is empty both of the above will raise StopIteration. This>> can have unintended consequences if the OrderedDict is called from another>> iterator/generator etc. So it should probably be:>>>> def first(od):>> try:>> return next(iter(od))>> except StopIteration:>> raise KeyError>> Agreed, though it's worth noting that as of Python 3.5, generators can> be made not-vulnerable to this problem (and as of 3.7ish, they> automatically will be protected). See PEP 479 for details. But yes,> turning that into KeyError is the right thing to do, and is exactly> why something like this wants to be a published recipe rather than> simply dismissed as "see how easy it is?".>> Does it belong in a collection like moreitertools?>> ChrisADoh. Next time, Chris, look first, *then* post.https://github.com/erikrose/more-itertools/blob/master/more_itertools/more.py#L40ChrisA
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