使用 Python 读取 YAML 文件的结果是 YAML.poserError: 预期流中只有一个文档

我有个 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

我能够在使用 YAML 的 Perl 中正确地读取它，但是在使用 YAML 的 python 中不能。它失败的原因是:

预期流中只有一个文档

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
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最佳答案

Yaml 文档由 ---分隔，如果任何流(例如文件)包含多个文档，那么应该使用 yaml.load_all函数而不是 yaml.load函数。密码:

import yaml


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

输入文件的结果如问题所示:

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

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