id summary reporter owner description type status priority component severity resolution keywords cc 173 Python regular expression named groups breaks (?) pyyaml anonymous xi "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.*)', 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 """", line 1, in 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.*)', 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.*)'"" 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. " defect closed normal pyyaml normal invalid