如何使用python附加到YAML文件 [英] How do I append to a YAML file with python
问题描述
我有一个名为data.yaml的YAML文件:
I have a YAML file called data.yaml:
---
'001':
name: Ben
email: ben@test.com
我想要一个更新的文件，如下所示:
I would like to have an updated file that looks like this:
---
'001':
name: Ben
email: ben@test.com
'002':
name: Lisa
email: lisa@test.com
numbers:
- 000-111-2222
- 000-111-2223
如何使用yaml包在python中实现此目标?
How do I achieve this in python using yaml package/s?
我尝试过:
import yaml
import io
data = {'002': {'name': 'Lisa', 'email': 'lisa@test.com', 'numbers': ['000-111-2222', '000-111-2223']}}
with io.open('data.yaml', 'w', encoding='utf8') as outfile:
yaml.safe_dump(data, outfile, default_flow_style=False, allow_unicode=True)
方法 safe_dump 会覆盖文件内容，我只能将其视为新文件内容！
Method safe_dump overrides the file content and I only see this as the new file content!
'002':
name: Lisa
email: lisa@test.com
numbers:
- 000-111-2222
- 000-111-2223
推荐答案
通常，您可以只写一些额外的代码就不会将其添加到文件中的YAML文档中. 该文件末尾的信息.此migth适用于具有以下内容的YAML文档: 顶层的块映射或序列，甚至 那么仅附加文件仅适用于某些情况下的文件.
You can, in general, not add to a YAML document in a file by just writing extra information at the end of that file. This migth work for YAML documents that have a mapping or sequence at the top level that is block style, but even then simply appending can only work for certain cases of documents.
将YAML加载到Python数据结构很容易，
更新/扩展该结构，然后将其转回.这样你就不会
必须处理潜在的重复密钥，非裸露的文件和
使用简单时会导致无效YAML的其他问题
附加中.假设您的原始文件称为input.yaml，
以下是窍门:
It is easy to just load your YAML to Python datastructure,
update/extend that structure and then dump it back. That way you don't
have to deal with potential duplicate keys, non-bare documents and
other issues that will result in invalid YAML when you use simple
appending. Assumping your original file is called input.yaml, the
following does the trick:
import sys
from pathlib import Path
import ruamel.yaml
file_name = Path('input.yaml')
record_to_add = dict(name='Lisa', email='lisa@test.com', numbers=['000-111-2222', '000-111-2223'])
yaml = ruamel.yaml.YAML()
yaml.explicit_start = True
data = yaml.load(file_name)
data['002'] = record_to_add
yaml.dump(data, sys.stdout)
给出:
---
'001':
name: Ben
email: ben@test.com
'002':
name: Lisa
email: lisa@test.com
numbers:
- 000-111-2222
- 000-111-2223
这篇关于如何使用python附加到YAML文件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
