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#63 invalid % character cannot start a scalar value token xi sproaticus

Reported by sproaticus, 8 years ago.


A scalar value cannot start with a % (percent sign) character, though the YAML specification only reserves that character at the beginning of a non-indented line for directives and tags (see and ). This character should be legal as the first character of a scalar value, e.g. for Python %s-style string substitution and templates.

>>> yaml.load('yaml: %')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.5/site-packages/PIL/", line 66, in load
  File "build/bdist.linux-i686/egg/yaml/", line 38, in get_data
  File "build/bdist.linux-i686/egg/yaml/", line 27, in get_node
  File "build/bdist.linux-i686/egg/yaml/", line 34, in compose_document
  File "build/bdist.linux-i686/egg/yaml/", line 63, in compose_node
  File "build/bdist.linux-i686/egg/yaml/", line 112, in compose_mapping_node
  File "build/bdist.linux-i686/egg/yaml/", line 43, in compose_node
  File "build/bdist.linux-i686/egg/yaml/", line 95, in check_event
  File "build/bdist.linux-i686/egg/yaml/", line 446, in parse_block_mapping_value
  File "build/bdist.linux-i686/egg/yaml/", line 116, in check_token
  File "build/bdist.linux-i686/egg/yaml/", line 257, in fetch_more_tokens
yaml.scanner.ScannerError: while scanning for the next token
found character '%' that cannot start any token
  in "<string>", line 1, column 7:
    yaml: %


  • Python 2.5.1 (r251:54863, May 2 2007, 16:56:35) [GCC 4.1.2 (Ubuntu 4.1.2-0ubuntu4)] on linux2
  • PyYAML-3.05-py2.5.egg
#64 fixed yaml.dump and indentation: xi…

Reported by…, 8 years ago.


In python, when I have :

y = {'x' : 3, z : [{'val' : 3}, {'val' : 4}]} yaml.dump(y, default_flow_style=False)

The result is: 'x: 3\nz:\n- val: 3\n- val: 4\n'

I believe there should be a space before each hypen.



#65 worksforme Noise in output xi miki@…

Reported by miki@…, 8 years ago.


Sometimes when dumping a large dictionary, some stray "--" are generated.

The dictionary of type (string -> list). Example output:

- icco
- oecd
- un
--- - iea
- eca
- adb-africa
- adb-asia

I can provide a test case that cases the error on my machine, mail me.

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