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Ticket Resolution Summary Owner Reporter
#85 fixed PyYaml don't have a version xi miki@…

Reported by miki@…, 6 years ago.

Description

There is currently no way I could find to detect the current version of PyYaml? I'm using.

There should be a __version__ in the top level yaml module

#130 fixed Python 3.1 support? xi tom.aldenberg@…

Reported by tom.aldenberg@…, 5 years ago.

Description

Hi, I wanted to try PyYaml? under 3.1rc2, but the installment procedure refused to recognize, or name, a directory other than Python30.

#173 invalid Python regular expression named groups breaks (?) pyyaml xi anonymous

Reported by anonymous, 3 years ago.

Description

I'm using pyyaml 3.09 in Python 2.6.5 on Ubuntu 10.04 LTS.

I have a yaml file I used for configuration of a web server (tornado), and the section of my file causing issues looks like this:

RequestHandlers:
  # [ path, handler class, [whitelist] ]
   - [/stats, myapp.core.Stats, [127.0.0.1, 10.0.0.0/8]]
   - [r'/(?P<id>.*)', myapp.core.Foo, [127.0.0.1, 192.168.0.0/16]]
   - [/.*, myapp.core.MainHandler, []]

When this gets loaded, pyyaml yells at me. Here's a python interpreter session:

============================================

Python 2.6.5 (r265:79063, Apr 16 2010, 13:09:56) 
[GCC 4.4.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import yaml
>>> stream = open('etc/subzero.yaml')
>>> config = yaml.load(stream)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "build/bdist.linux-i686/egg/yaml/__init__.py", line 58, in load
    
  File "build/bdist.linux-i686/egg/yaml/constructor.py", line 42, in get_single_data
  File "build/bdist.linux-i686/egg/yaml/composer.py", line 36, in get_single_node
  File "build/bdist.linux-i686/egg/yaml/composer.py", line 55, in compose_document
  File "build/bdist.linux-i686/egg/yaml/composer.py", line 84, in compose_node
  File "build/bdist.linux-i686/egg/yaml/composer.py", line 133, in compose_mapping_node
  File "build/bdist.linux-i686/egg/yaml/composer.py", line 82, in compose_node
  File "build/bdist.linux-i686/egg/yaml/composer.py", line 111, in compose_sequence_node
  File "build/bdist.linux-i686/egg/yaml/composer.py", line 82, in compose_node
  File "build/bdist.linux-i686/egg/yaml/composer.py", line 110, in compose_sequence_node
  File "build/bdist.linux-i686/egg/yaml/parser.py", line 93, in check_event
  File "build/bdist.linux-i686/egg/yaml/parser.py", line 479, in parse_flow_sequence_entry
yaml.parser.ParserError: while parsing a flow sequence
  in "etc/myapp.yaml", line 35, column 5
expected ',' or ']', but got '?'
  in "etc/myapp.yaml", line 35, column 10

============================================

Line 35 is:

   - [r'/(?P<id>.*)', myapp.core.Foo, [127.0.0.1, 192.168.0.0/16]]

I'm wondering why it's choking here. Disabling this line causes everything to work perfectly well. The question mark is a special case in YAML, but (I thought) only when it's accompanied by a space. I don't recall ever needing to escape anything inside of a yaml file, but I tried escaping the '?'. Not sure what to try next. If I double-quote like "r'/(?P<id>.*)'" then it'll be a double-quoted string on the other end of the load as well, which doesn't help me.

Clue hereby solicited.

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