Which lib can diff two dict tree?

From	esbatmop@gmail.com
Newsgroups	comp.lang.python
Subject	Which lib can diff two dict tree?
Date	2012-07-19 02:51 -0700
Organization	http://groups.google.com
Message-ID	<b2000e25-8a8e-44bc-9895-9b406265578e@googlegroups.com> (permalink)

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Q1：
dict a：{'a1': 'b1', 'a2': {'b2': 'c2'}, 'a3': 'b3'}
dict b：{'a1': 'b1', 'a2': {'b2': 'c3'}}
which lib can diff two dict tree？
like：
print struct_diff(a，b)
>>tree 'a3'
print value_diff(a,b)
>>c3

Q2
How can I diff two json file?How can I get struct_diff and value_diff?

Q3
How can I diff two xml file? How can I get struct_diff and value_diff?

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Which lib can diff two dict tree? esbatmop@gmail.com - 2012-07-19 02:51 -0700
  Re: Which lib can diff two dict tree? alex23 <wuwei23@gmail.com> - 2012-07-19 17:17 -0700

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