python - 将字典转储到 YAML 文件，同时保留顺序

Question

我一直在尝试将字典转储到 YAML 文件中。问题在于导入 YAML 文件的程序需要按特定顺序排列关键字。此顺序不是按字母顺序排列。

import yaml
import os 

baseFile = 'myfile.dat'
lyml = [{'BaseFile': baseFile}]
lyml.append({'Environment':{'WaterDepth':0.,'WaveDirection':0.,'WaveGamma':0.,'WaveAlpha':0.}})

CaseName = 'OrderedDict.yml'
CaseDir = r'C:\Users\BTO\Documents\Projects\Mooring code testen'
CaseFile = os.path.join(CaseDir, CaseName)
with open(CaseFile, 'w') as f:
    yaml.dump(lyml, f, default_flow_style=False)

这会生成一个 *.yml 文件，其格式如下:

- BaseFile: myfile.dat
- Environment:
    WaterDepth: 0.0
    WaveAlpha: 0.0
    WaveDirection: 0.0
    WaveGamma: 0.0

但我想要的是保留顺序:

- BaseFile: myfile.dat
- Environment:
    WaterDepth: 0.0
    WaveDirection: 0.0
    WaveGamma: 0.0
    WaveAlpha: 0.0

这可能吗？

Answer 1

yaml.dump 有一个 sort_keys 关键字参数，默认设置为 True。将其设置为False以不重新排序:

with open(CaseFile, 'w') as f:
    yaml.dump(lyml, f, default_flow_style=False, sort_keys=False)