Re: [Yaml-core] !!python/unicode

[Clark C. E. <cc...@cl...>]

The following code makes PyYAML treat unicode and strings as 
equivalent (but, it means you no longer will be using string):

    # this is the magic that treats all strings as unicode
    def represent_unicode(dumper, data):
        return dumper.represent_scalar("tag:yaml.org,2002:str", data)
    def construct_unicode(loader, node):
        return unicode(loader.construct_scalar(node))
    yaml.add_representer(unicode, represent_unicode)
    yaml.add_constructor("tag:yaml.org,2002:str", construct_unicode)

    # simple test
    assert u'hi' == yaml.load(yaml.dump(u'hi'))
    assert u'\0x2C' == yaml.load(yaml.dump(u'\0x2C'))
    assert u'\0xDA' == yaml.load(yaml.dump(u'\0xDA'))

Similar code could be used to convert tuples into
'tag:yaml.org,2002:seq' (aka lists) on the way out, but then
you'd be loading all tuples back in as lists.

Hope this helps!

Clark

On Wed, Oct 18, 2006 at 11:34:20AM -0400, Dimi Paun wrote:
| Folks,
| 
| I am trying to make use of PyYAML in my project, however I'm having a
| problem with these !!python/* types:
|   * when serializing u'abc' I get !!python/unicode 'abc'
|   * when serializing (1, 2) I get !!python/tuple
| There may be others, but I haven't enountered them yet.
| 
| My main concern is that these things appear to have perfectly
| 'standard' YAML representations, which is what I want. Having
| this Python specific types in there has a number of disadvantages:
|   * I can not deserialize the data from non-python programs
|   * It is ugly to look at and may confuse users
|   * It exposes way too much of the implemenation behind it
| 
| Bottom line: how can I convince PyYAML to try extra hard to use
| standard YAML representations when possible?
| 
| -- 
| Dimi Paun <di...@la...>
| Lattica, Inc.
| 
| 
| 
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