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Ticket Resolution Summary Owner Reporter
#15 fixed pyyaml discards '-' sign on negative floats xi alex_(a)_alexmole_(o)_co_(o)_uk

Reported by alex_(a)_alexmole_(o)_co_(o)_uk, 8 years ago.

Description

yaml.load( 'foo: -3.1' ) returns {'foo': 3.10000}

The same technique preserves the sign of integers though, so I presume it must be a bug rather than a yaml feature.

#17 fixed Single quote character can break emitter output xi apopheniac.reply.pyyaml@…

Reported by apopheniac.reply.pyyaml@…, 8 years ago.

Description

If a string contains a space followed by a single quote character, PyYaml?'s emitter fails to duplicate the single quote. The resulting YAML output yields a parse error:

>>> map = {'key': " 'single quoted text'"}
>>> yaml.dump(map)
"{key: ' 'single quoted text'''}\n"
>>> yaml.load(yaml.dump(map))
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "/home/apopheniac/lib/python/yaml/__init__.py", line 61, in load
    return loader.get_data()
  File "/home/apopheniac/lib/python/yaml/constructor.py", line 41, in get_data
    return self.construct_document(self.get_node())
  File "/home/apopheniac/lib/python/yaml/composer.py", line 23, in get_node
    return self.compose_document()
  File "/home/apopheniac/lib/python/yaml/composer.py", line 40, in compose_document
    node = self.compose_node(None, None)
  File "/home/apopheniac/lib/python/yaml/composer.py", line 69, in compose_node
    node = self.compose_mapping_node(anchor)
  File "/home/apopheniac/lib/python/yaml/composer.py", line 112, in compose_mapping_node
    while not self.check_event(MappingEndEvent):
  File "/home/apopheniac/lib/python/yaml/parser.py", line 78, in check_event
    self.current_event = self.event_generator.next()
  File "/home/apopheniac/lib/python/yaml/parser.py", line 129, in parse_stream
    for event in self.parse_block_node():
  File "/home/apopheniac/lib/python/yaml/parser.py", line 323, in parse_node
    for event in collection_events:
  File "/home/apopheniac/lib/python/yaml/parser.py", line 472, in parse_flow_mapping
    "expected ',' or '}', but got %r" % token.id, token.start_mark)
yaml.parser.ParserError: while scanning a flow mapping
  in "<string>", line 1, column 1:
    {key: ' 'single quoted text'''}
    ^
expected ',' or '}', but got '<scalar>'
  in "<string>", line 1, column 10:
    {key: ' 'single quoted text'''}
             ^

If each single quote is preceded by a non-space character, then the error disappears:

>>> map = {"key": " foo'single quoted text'"}
>>> yaml.dump(map)
"{key: ' foo''single quoted text'''}\n"
>>> yaml.load(yaml.dump(map))
{'key': " foo'single quoted text'"}

The error seems to lie in the write_single_quoted function of module emitter.py. I've only encountered this problem with scalars represented in single quoted style.

#18 worksforme [bug] nested dictionnary load works dump doesn't xi eugene@…

Reported by eugene@…, 8 years ago.

Description
import yaml
data=yaml.load("""
a: 1
b:
    ba: 1
    bb: 2
""")
yaml.dump(data)

[gives]

 'a: 1\nb: {ba: 1, bb: 2}\n'

pyYaml 3.0.3 - Python 2.4.3 - Windows XP

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