使用Python读取YAML文件导致yaml.composer.ComposerError:期望流中的单个文档

时间:2013-01-16 13:27:52

标签: python yaml pyyaml

我有一个看起来像

的yaml文件
---
level_1: "test"
level_2: 'NetApp, SOFS, ZFS Creation'
request: 341570
---
level_1: "test"
level_2: 'NetApp, SOFS, ZFS Creation'
request: 341569
---
level_1: "test"
level_2: 'NetApp, SOFS, ZFS Creation'
request: 341568

我能够在Perl中使用YAML正确读取此内容,但在使用YAML的python中无法正确读取。它失败并出现错误:

  

预计流中的单个文档

程序:

import yaml

stram = open("test", "r")
print yaml.load(stram)

错误:

Traceback (most recent call last):
  File "abcd", line 4, in <module>
    print yaml.load(stram)
  File "/usr/local/pkgs/python-2.6.5/lib/python2.6/site-packages/yaml/__init__.py", line 58, in load
    return loader.get_single_data()
  File "/usr/local/pkgs/python-2.6.5/lib/python2.6/site-packages/yaml/constructor.py", line 42, in get_single_data
    node = self.get_single_node()
  File "/usr/local/pkgs/python-2.6.5/lib/python2.6/site-packages/yaml/composer.py", line 43, in get_single_node
    event.start_mark)
yaml.composer.ComposerError: expected a single document in the stream
  in "test", line 2, column 1
but found another document
  in "test", line 5, column 1

1 个答案:

答案 0 :(得分:91)

yaml文档由---分隔,如果任何流(例如文件)包含多个文档,则应使用yaml.load_all函数而不是yaml.load。代码:

import yaml

stream = open("test", "r")
docs = yaml.load_all(stream)
for doc in docs:
    for k,v in doc.items():
        print k, "->", v
    print "\n",

导致问题中提供的输入文件:

request -> 341570
level_1 -> test
level_2 -> NetApp, SOFS, ZFS Creation

request -> 341569
level_1 -> test
level_2 -> NetApp, SOFS, ZFS Creation

request -> 341568
level_1 -> test
level_2 -> NetApp, SOFS, ZFS Creation