[PATCH] mq: refactor usage of repo.branchmap().iteritems() with itervalues()

[Martin Geisler]

Kevin Bullock <kbullock+mercurial at ringworld.org> writes:

> On 25 Sep 2013, at 4:38 PM, Brodie Rao wrote:
>
>> # HG changeset patch
>> # User Brodie Rao <brodie at sf.io>
>> # Date 1364871676 25200
>> #      Mon Apr 01 20:01:16 2013 -0700
>> # Node ID 5ddfc6e253794f76691b27f805b1275d54708298
>> # Parent  50d721553198cea51c30f53b76d41dc919280097
>> mq: refactor usage of repo.branchmap().iteritems() with itervalues()
>> 
>> diff --git a/hgext/mq.py b/hgext/mq.py
>> --- a/hgext/mq.py
>> +++ b/hgext/mq.py
>> @@ -1222,9 +1222,7 @@ class queue(object):
>>         diffopts = self.diffopts()
>>         wlock = repo.wlock()
>>         try:
>> -            heads = []
>> -            for b, ls in repo.branchmap().iteritems():
>> -                heads += ls
>> +            heads = [h for hs in repo.branchmap().itervalues() for h in hs]
>
> The double-`for` is really confusing to me here.

Yeah, it's a slightly unusual construct.

I would prefer a loop over itervalues (that's a good change) and then
use extend instead +=. I find extend better because it has no return
value and no return value is needed or wanted here.

-- 
Martin Geisler
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