使用PyYAML的Python的YAML

时间:2015-07-31 21:06:25

标签: python yaml pyyaml

我想尝试这两个例子:

Parsing a YAML file in Python, and accessing the data?

YAML parsing and Python?

但由于某种原因,我不断收到以下错误消息:

Traceback (most recent call last):
  File "test.py", line 3, in <module>
    doc = yaml.load(f)
  File "/usr/local/lib/python2.7/dist-packages/yaml/__init__.py", line 71, in load
    return loader.get_single_data()
  File "/usr/local/lib/python2.7/dist-packages/yaml/constructor.py", line 37, in get_single_data
    node = self.get_single_node()
  File "/usr/local/lib/python2.7/dist-packages/yaml/composer.py", line 36, in get_single_node
    document = self.compose_document()
  File "/usr/local/lib/python2.7/dist-packages/yaml/composer.py", line 55, in compose_document
    node = self.compose_node(None, None)
  File "/usr/local/lib/python2.7/dist-packages/yaml/composer.py", line 84, in compose_node
    node = self.compose_mapping_node(anchor)
  File "/usr/local/lib/python2.7/dist-packages/yaml/composer.py", line 133, in compose_mapping_node
    item_value = self.compose_node(node, item_key)
  File "/usr/local/lib/python2.7/dist-packages/yaml/composer.py", line 64, in compose_node
    if self.check_event(AliasEvent):
  File "/usr/local/lib/python2.7/dist-packages/yaml/parser.py", line 98, in check_event
    self.current_event = self.state()
  File "/usr/local/lib/python2.7/dist-packages/yaml/parser.py", line 449, in parse_block_mapping_value
    if not self.check_token(KeyToken, ValueToken, BlockEndToken):
  File "/usr/local/lib/python2.7/dist-packages/yaml/scanner.py", line 116, in check_token
    self.fetch_more_tokens()
  File "/usr/local/lib/python2.7/dist-packages/yaml/scanner.py", line 257, in fetch_more_tokens
    % ch.encode('utf-8'), self.get_mark())
yaml.scanner.ScannerError: while scanning for the next token
found character '\t' that cannot start any token
  in "tree.yaml", line 2, column 1

我通过执行以下操作安装了PyYAML:

python setup.py install

我还测试了它:

python setup.py test

似乎没问题。

现在授予我对Python和YAML有点新意,但我已经按照这两个字母的链接。我有一个名为tree.yaml的文件和一个名为test.py的文件,每个文件包含以下内容:

test.py

import yaml
with open('tree.yaml', 'r') as f:
    doc = yaml.load(f)

txt = doc["treeroot"]["branch1"]
print txt

tree.yaml

treeroot:
        branch1: branch1 text
        branch2: branch2 text

在你问之前,是的,我验证了我的标签空间,并通过验证器运行了YAML文件。知道为什么这不起作用吗?好像它无法与PyYAML通信。我再次对这一切都很陌生,所以我还不了解它是如何工作的以及如何整合所有这些。

感谢您的帮助!

我要回家过一天,所以将远离电脑一点点。将尽快回来或尝试通过电话回复/回答任何问题。

由于

1 个答案:

答案 0 :(得分:1)

Yaml文件使用空格,而不是制表符作为缩进。在您提供的错误中,显然第二行中的第一个字符是标签。请用2或4个空格替换它,它应该可以工作。

标签不在yaml中,因为不同的编辑器和工具会对它们进行不同的处理。为了避免这种混乱,你应该使用空格。