On Thu, Apr 12, 2012 at 11:59 AM, John Nagle <na...@animats.com> wrote:
> On 4/12/2012 10:41 AM, Roy Smith wrote:
>>
>> Is there a simple way to deep merge two dicts? I'm looking for Perl's
>> Hash::Merge (http://search.cpan.org/~dmuey/Hash-Merge-0.12/Merge.pm)
>> in Python.
>
>
> def dmerge(a, b) :
> for k in a :
> v = a[k]
> if isinstance(v, dict) and k in b:
> dmerge(v, b[k])
> a.update(b)
That doesn't work. After b[k] is recursively merged into a[k], the
call "a.update(b)" copies b[k] into a[k], discarding the merged dict.
Try this:
def dmerge(a, b):
for k, v in b.items():
if isinstance(v, dict) and k in a:
dmerge(a[k], v)
else:
a[k] = v
Hash::Merge also does a lot more than this, but I'm not sure exactly
which functionality the OP is looking for.
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