python yaml update preserving order and comments

Question

Im inserting a key into Yaml using python but I would like to preserve order and comments in the yaml

#This Key is used for identifying Parent tests
    Pare         


        

Answer 1

pyyaml cannot keep comments, but ruamel does.

Try this:

doc = ruamel.yaml.load(yaml, Loader=ruamel.yaml.RoundTripLoader)
doc['ParentTest']['test']['new_key'] = 'new value'
print ruamel.yaml.dump(doc, Dumper=ruamel.yaml.RoundTripDumper)

The order of keys will also be preserved.