pyYAML - Error - Attribute Error: no attribute “load”

Question

Well, I'm playing with pyYAML. I installed the version for Python 2.7 with the Windows installer.

It imports just fine:

import yaml

and it throws no errors.

But, if I do this:

import yaml

f = open("sets.yml")
dataMap = yaml.load(f)
f.close()

print dataMap

It throws an attribute error and says 'module' object has no attribute 'load'.

I tried dump, and got the same thing. Also same thing for importing like this:

from yaml import load

Anyone have any ideas?

Oh, and also, I thought it was weird -- whenever I run the script, it created a .pyc of it. Why is that?

Answer 1

If another file named yaml.py is on your sys.path BEFORE the actual PyYaml library, you'll pick up and import that yaml.py file. This includes if you've named your own file yaml.py.

The fact that you're getting yaml.pyc in your directory indicates that this is exactly what you're doing. Your import yaml statement is loading in your own yaml.py file, which causes the interpreter to compile it to yaml.pyc for more efficient running.

Rename the yaml.py file in your directory. Do not name any python file you're working on with the same name as any existing python module you're using, as a general rule.

Answer 2

PyYAML-3.10 has load():

jcomeau@intrepid:/usr/src/clusterFix$ easy_install pyyaml
Searching for pyyaml
Reading http://pypi.python.org/simple/pyyaml/
Reading http://pyyaml.org/wiki/PyYAML
Best match: PyYAML 3.10
Downloading http://pyyaml.org/download/pyyaml/PyYAML-3.10.zip
Processing PyYAML-3.10.zip
Running PyYAML-3.10/setup.py -q bdist_egg --dist-dir /tmp/easy_install-2PnFkZ/PyYAML-3.10/egg-dist-tmp-kCMq7S
build/temp.linux-i686-2.6/check_libyaml.c:2:18: fatal error: yaml.h: No such file or directory
compilation terminated.

libyaml is not found or a compiler error: forcing --without-libyaml
(if libyaml is installed correctly, you may need to
 specify the option --include-dirs or uncomment and
 modify the parameter include_dirs in setup.cfg)
zip_safe flag not set; analyzing archive contents...
Adding PyYAML 3.10 to easy-install.pth file

Installed /usr/local/lib/python2.6/dist-packages/PyYAML-3.10-py2.6-linux-i686.egg
Processing dependencies for pyyaml
Finished processing dependencies for pyyaml
jcomeau@intrepid:/usr/src/clusterFix$ python
Python 2.6.7 (r267:88850, Jun 13 2011, 22:03:32) 
[GCC 4.6.1 20110608 (prerelease)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import yaml
>>> dir(yaml)
['AliasEvent', 'AliasToken', 'AnchorToken', 'BaseDumper', 'BaseLoader', 'BlockEndToken', 'BlockEntryToken', 'BlockMappingStartToken', 'BlockSequenceStartToken', 'CollectionEndEvent', 'CollectionNode', 'CollectionStartEvent', 'DirectiveToken', 'DocumentEndEvent', 'DocumentEndToken', 'DocumentStartEvent', 'DocumentStartToken', 'Dumper', 'Event', 'FlowEntryToken', 'FlowMappingEndToken', 'FlowMappingStartToken', 'FlowSequenceEndToken', 'FlowSequenceStartToken', 'KeyToken', 'Loader', 'MappingEndEvent', 'MappingNode', 'MappingStartEvent', 'Mark', 'MarkedYAMLError', 'Node', 'NodeEvent', 'SafeDumper', 'SafeLoader', 'ScalarEvent', 'ScalarNode', 'ScalarToken', 'SequenceEndEvent', 'SequenceNode', 'SequenceStartEvent', 'StreamEndEvent', 'StreamEndToken', 'StreamStartEvent', 'StreamStartToken', 'TagToken', 'Token', 'ValueToken', 'YAMLError', 'YAMLObject', 'YAMLObjectMetaclass', '__builtins__', '__doc__', '__file__', '__name__', '__package__', '__path__', '__version__', '__with_libyaml__', 'add_constructor', 'add_implicit_resolver', 'add_multi_constructor', 'add_multi_representer', 'add_path_resolver', 'add_representer', 'compose', 'compose_all', 'composer', 'constructor', 'dump', 'dump_all', 'dumper', 'emit', 'emitter', 'error', 'events', 'load', 'load_all', 'loader', 'nodes', 'parse', 'parser', 'reader', 'representer', 'resolver', 'safe_dump', 'safe_dump_all', 'safe_load', 'safe_load_all', 'scan', 'scanner', 'serialize', 'serialize_all', 'serializer', 'tokens']