Chris Angelico wrote:
> On Wed, May 18, 2016 at 7:28 PM, Peter Otten <__pete...@web.de> wrote:
>> I don't see an official way to pass a custom dict type to the library,
>> but if you are not afraid to change its source code the following patch
>> will allow you to access the value of dictionaries with a single entry as
>> d[0]:
>>
>> $ diff -u py2b_xmltodict/local/lib/python2.7/site-packages/xmltodict.py
>> py2_xmltodict/local/lib/python2.7/site-packages/xmltodict.py
>> --- py2b_xmltodict/local/lib/python2.7/site-packages/xmltodict.py
>> 2016-05-18 11:18:44.000000000 +0200
>> +++ py2_xmltodict/local/lib/python2.7/site-packages/xmltodict.py
>> 2016-05-18 11:11:13.417665697 +0200 @@ -35,6 +35,13 @@
>> __version__ = '0.10.1'
>> __license__ = 'MIT'
>>
>> +_OrderedDict = OrderedDict
>> +class OrderedDict(_OrderedDict):
>> + def __getitem__(self, key):
>> + if key == 0:
>> + [result] = self.values()
>> + return result
>> + return _OrderedDict.__getitem__(self, key)
>>
>> class ParsingInterrupted(Exception):
>> pass
>
> Easier than patching might be monkeypatching.
>
> class OrderedDict(OrderedDict):
> ... getitem code as above ...
> xmltodict.OrderedDict = OrderedDict
>
> Try it, see if it works.
It turns out I was wrong on (at least) two accounts:
- xmltodict does offer a way to specify the dict type
- the proposed dict implementation will not solve the OP's problem
Here is an improved fix which should work:
$ cat sample.xml
<?xml version="1.0" encoding="utf-8" ?>
<profiles>
<profile id='visio02' revision='2015051501' >
<package package-id='0964-gpg4win' />
</profile>
</profiles>
$ cat sample2.xml
<?xml version="1.0" encoding="utf-8" ?>
<profiles>
<profile id='visio02' revision='2015051501' >
<package package-id='0964-gpg4win' />
<package package-id='0965-gpg4win' />
</profile>
</profiles>
$ cat demo.py
import collections
import sys
import xmltodict
class MyOrderedDict(collections.OrderedDict):
def __getitem__(self, key):
if key == 0 and len(self) == 1:
return self
return super(MyOrderedDict, self).__getitem__(key)
def main():
filename = sys.argv[1]
with open(filename) as f:
doc = xmltodict.parse(f.read(), dict_constructor=MyOrderedDict)
print "doc:\n{}\n".format(doc)
print "package-id: {}".format(
doc['profiles']['profile']['package'][0]['@package-id'])
if __name__ == "__main__":
main()
$ python demo.py sample.xml
doc:
MyOrderedDict([(u'profiles', MyOrderedDict([(u'profile',
MyOrderedDict([(u'@id', u'visio02'), (u'@revision', u'2015051501'),
(u'package', MyOrderedDict([(u'@package-id', u'0964-gpg4win')]))]))]))])
package-id: 0964-gpg4win
$ python demo.py sample2.xml
doc:
MyOrderedDict([(u'profiles', MyOrderedDict([(u'profile',
MyOrderedDict([(u'@id', u'visio02'), (u'@revision', u'2015051501'),
(u'package', [MyOrderedDict([(u'@package-id', u'0964-gpg4win')]),
MyOrderedDict([(u'@package-id', u'0965-gpg4win')])])]))]))])
package-id: 0964-gpg4win
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