Here’s an improved version of puzzlet’s answer: import yaml from yaml.loader import SafeLoader class SafeLineLoader(SafeLoader): def construct_mapping(self, node, deep=False): mapping = super(SafeLineLoader, self).construct_mapping(node, deep=deep) # Add 1 so line numbering starts at 1 mapping[‘__line__’] = node.start_mark.line + 1 return mapping You can use it like this: data = yaml.load(whatever, Loader=SafeLineLoader)
import yaml class folded_unicode(unicode): pass class literal_unicode(unicode): pass def folded_unicode_representer(dumper, data): return dumper.represent_scalar(u’tag:yaml.org,2002:str’, data, style=”>”) def literal_unicode_representer(dumper, data): return dumper.represent_scalar(u’tag:yaml.org,2002:str’, data, style=”|”) yaml.add_representer(folded_unicode, folded_unicode_representer) yaml.add_representer(literal_unicode, literal_unicode_representer) data = { ‘literal’:literal_unicode( u’by hjw ___\n’ ‘ __ /.-.\\\n’ ‘ / )_____________\\\\ Y\n’ ‘ /_ /=== == === === =\\ _\\_\n’ ‘( /)=== == === === == Y … Read more
I don’t think there is. At least not on spec (http://yaml.org/spec/1.2/spec.html). People add non-official tags to yaml (and wikipedia seems to say there’s proposal for a yield tag, though they don’t say who proposed or where: http://en.wikipedia.org/wiki/YAML#cite_note-16), but nothing like you need seems to be available in pyyaml. Looking at pyyaml specific tags there doesn’t … Read more
Here’s a version which overrides the PyYAML handling of strings by always outputting unicode. In reality, this is probably the identical result of the other response I posted except shorter (i.e. you still need to make sure that strings in custom classes are converted to unicode or passed unicode strings yourself if you use custom … Read more
Important security disclaimer: I would strongly discourage anyone downgrading PyYAML to 5.3.1, as versions before 5.4 all have a known CVE — CVE-2020-14343. This issue was caused by an incompatibility of PyYAML<6.0.1 compiled under the version of Cython>=3.0, released on July 17, 2023. This has now been fixed by a new release of PyYAML, tagged … Read more
I tried many combinations and the only one I can find that consistently produces the correct YAML output is: yaml.safe_dump(data, file(filename,’w’), encoding=’utf-8′, allow_unicode=True)
I wouldn’t call what you’ve done hacky for what you are trying to do. Your alternative approach from my understanding is to make use of python-specific tags in your YAML file so it is represented appropriately when loading the yaml file. However, this requires you modifying your yaml file which, if huge, is probably going … Read more
Found the answer myself. I just had to dump it with the argument allow_unicode=True Source: http://dpinte.wordpress.com/2008/10/31/pyaml-dump-option/
For None type to be read from python use null in yaml A YAML file test.yml like this foo: null bar: null will be read by python as import yaml test = yaml.load(open(‘./test.yml’)) print(test) foo: None bar: None
The problem lies in the fact that the YAML Resolver is set up to match floats as follows: Resolver.add_implicit_resolver( u’tag:yaml.org,2002:float’, re.compile(u”’^(?:[-+]?(?:[0-9][0-9_]*)\\.[0-9_]*(?:[eE][-+][0-9]+)? |\\.[0-9_]+(?:[eE][-+][0-9]+)? |[-+]?[0-9][0-9_]*(?::[0-5]?[0-9])+\\.[0-9_]* |[-+]?\\.(?:inf|Inf|INF) |\\.(?:nan|NaN|NAN))$”’, re.X), list(u’-+0123456789.’)) whereas the YAML spec specifies the regex for scientific notation as: -? [1-9] ( \. [0-9]* [1-9] )? ( e [-+] [1-9] [0-9]* )? the latter makes the … Read more