Custom sort order for YAML output

Dear list,

Bearing in mind I'm new to PyYAML, please could you help with the following.

I'm using PyYAML to convert dumped YAML data from Django (which is flow
style by default) into block style via the following Python script:

[BEGIN]
from optparse import OptionParser
import yaml

def main():
    # set up optparse
    usage = "usage: %prog [options] INPUT\nReads yaml from INPUT and returns
it as block style yaml to stdout"
    parser = OptionParser(usage)
    (options, args) = parser.parse_args()
    if len(args) != 1:
        parser.error("incorrect number of arguments")

    # get some flow style YAML from FILE1
    try:
        infile = open(args[0])
    except IOError:
        print 'Cannot open input file: ', args[0]
    else:
        input = infile.read()
        output = yaml.dump(yaml.load(input), default_flow_style=False)
        print output

# execute main()
if __name__ == "__main__":
    main()
[END]

This works, but I'd like to output the data in the order shown
here<http://docs.djangoproject.com/en/dev/howto/initial-data/#providing-initial-data-with-fixtures>-
in other words, in the form:

- model:
  pk:
  fields:

I'd also like the fields to be sorted alphabetically.

This ticket <http://pyyaml.org/ticket/23> suggests to me that this should be
possible, but I'm not sure how best to insert a "custom representer" into
the script above, in order to get the result I'm seeking.

I'd be grateful for any help you can offer.

Many thanks in advance,

Sam

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