CODEWITHSUNDEEP
pythondictionaryyamldumppython-2.x
Basj
Basj

Reputation: 46303

YAML and tuples as dict key

Let

d = {3: u'blah', u'b': u'foo', (12,2,3) : u'bonjour'}

be a dictionary. If I use 

g = yaml.dump(d)
h = yaml.load(g)
print g, h

it's very good, but I get lots of !!python/unicode everywhere, so that's not good for readability.

On the other hand, if I use :

g = yaml.safe_dump(d)
h = yaml.load(g)
print g, h

there are no-more the !!python/unicode but also not the !!python/tuple anymore, so the load doesn't work because the tuple isn't understood correctly.

How to get the right balance with YAML ?

Upvotes: 2

Views: 4048

Answers (1)

larsks
larsks

Reputation: 312370

If you search for python yaml unicode, the very first result is this bug report, which has exactly the solution you're looking for. In short, register a custom representer for unicode strings, like this:

yaml.add_representer(unicode, 
                     lambda dumper, value: dumper.represent_scalar(u'tag:yaml.org,2002:str', value))

With this in place, your example renders like this:

>>> d = {3: u'blah', u'b': u'foo', (12,2,3) : u'bonjour'}
>>> print yaml.dump(d)
3: blah
? !!python/tuple [12, 2, 3]
: bonjour
b: foo

Upvotes: 3

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