'yaml.parser.ParserError：预期为'< document start>'是什么，但是发现'< block映射开始>''是什么意思？ [英] What does 'yaml.parser.ParserError: expected '<document start>', but found '<block mapping start>'' mean?

问题描述

我有以下YAML文件：

I have the following YAML file:

[mysqld]
user: "mysql"
pid-file: /var/run/mysqld/mysqld.pid
skip-external-locking
old_passwords: 1
skip-bdb
skip-innodb
create_key: yes
needs_agent: no
knows_oop: True
likes_emacs: TRUE
women:
    - Mary Smith
    - Susan Williams

和以下Python代码：

and the following Python code:

#!/usr/bin/env python

import yaml


with open("config.yml") as f:
    sample_config = f.read()

print(yaml.load(sample_config))

但是它给了我

Traceback (most recent call last):
  File "/home/moose/Desktop/bla.py", line 9, in <module>
    print(yaml.load(sample_config))
  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 39, in get_single_node
    if not self.check_event(StreamEndEvent):
  File "/usr/local/lib/python2.7/dist-packages/yaml/parser.py", line 98, in check_event
[Finished in 0.1s with exit code 1]
[shell_cmd: python -u "/home/moose/Desktop/bla.py"]
[dir: /home/moose/Desktop]
[path: /usr/local/texlive/2013/bin/x86_64-linux:/home/moose/google-cloud-sdk/bin:/home/moose/Downloads/google_appengine:/usr/local/texlive/2013/bin/x86_64-linux:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games]    self.current_event = self.state()
  File "/usr/local/lib/python2.7/dist-packages/yaml/parser.py", line 174, in parse_document_start
    self.peek_token().start_mark)
yaml.parser.ParserError: expected '<document start>', but found '<block mapping start>'
  in "<string>", line 2, column 1:
    user: "mysql"

我不知道是什么

expected '<document start>', but found '<block mapping start>'

以及如何修理它。什么是< document start> ，什么是<块映射开始> ？

means and how to fix it. What is <document start> and what is a <block mapping start>?

推荐答案

您的文件不是有效的YAML。它看起来像是YAML和 INI文件的混合体。

Your file isn't valid YAML. It looks like a mix of YAML and INI file.

• 您无法在YAML中定义诸如 [mysql] 之类的块。如果要定义相关属性的集合，请使用带有嵌套键的列表：

• You can't define blocks like [mysql] in YAML. If you want to define a collection of related properties, use a list with nested keys:

- service:
    name: mysql
    type: database
    port: 3306
- service:
    name: ssh
    type: remote access
    port: 22

您不能像 skip-external-locking 。每个属性都需要一个值。请使用 skip-external-locking：true 。

You can't have bare words like skip-external-locking. Each property requires a value. Use skip-external-locking: true instead.

这是文档版本，其语法错误已修复。我使用 YAMLLint （一种用于验证YAML的便捷工具）进行了检查。

Here's a version of your document with the syntax errors fixed. I checked this over with YAMLLint, a handy tool for validating YAML.

name: mysqld
user: mysql
pid-file: /var/run/mysqld/mysqld.pid
skip-external-locking: true
old_passwords: 1
skip-bdb: true
skip-innodb: true
create_key: yes
needs_agent: no
knows_oop: True
likes_emacs: TRUE
women:
    - Mary Smith
    - Susan Williams

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