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Python: read and dump dictionary to YAML preserving order
```python
import collections , yaml
_mapping_tag = yaml.resolver.BaseResolver.DEFAULT_MAPPING_TAG
def dict_representer(dumper, data):
return dumper.represent_mapping(_mapping_tag, data.iteritems())
def dict_constructor(loader, node):
return collections.OrderedDict(loader.construct_pairs(node))
yaml.add_representer( collections.OrderedDict , dict_representer )
yaml.add_constructor( _mapping_tag, dict_constructor )
with open( yaml_filein , 'r' ) as stream:
dict = yaml.load( stream )
with open( yaml_fileout , 'w' ) as outfile:
yaml.dump( dict , outfile , default_flow_style=False )
```
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