unmarshalling using yaml.dump doesn't maintain proper format (PyYAML)

Hi list,
I am using the PyYAML implementation for yaml (They don't have their own
mailing list, so I'm bringing this question here. I hope some folks are
familiar with it and can assist.

I have the following yaml doc:
---
instance:
     id: i-1234567
     saltId: APPSRV-X
     grains:
       roles:
         - webserver
         - php
       environment: X

I then try to dump it from one file to another, there are multiple yaml
docs in this file, and I am picking one doc and copying it to another file
basically.

Here is the code I used to do it:
https://gist.github.com/3941410

This is the resulting output:

id: APPSRV-X
environment: X
roles: [webserver, php]

For some reason it doesn't maintain it's structure, and I cannot figure out
how to keep it.

I tried changing the line with
            yaml.dump(configDict['instance']['grains'], TEST_CONFIG_FILE)


to
            yaml.dump(configDict['instance']['id'], TEST_CONFIG_FILE)


and the output get's even stranger:
id: APPSRV-X
i-1234567
...

any help is appreciated.

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