访问 YAML 中的嵌套元素并输出有序的唯一 python 列表

Access nested elements in YAML and output ordered unique python list

我正在尝试解析 yaml-file 以将嵌套的 child-elements 输出到有序的唯一 python 列表中,该列表不包含重复值。我的输入 yaml-file 是:

# example.yml

name_1:
  parameters:
    - soccer
    - football
    - basketball
    - cricket
    - hockey
    - table tennis
  tag:
    - navigation
  assets:
    - url

name_2:
  parameters:
  - soccer
  - rugby
  - swimming
  examples:
  - use case 1
  - use case 2
  - use case 3

我设法打印出所有 parents 中的第一个 child,它们是:

['assets', 'examples', 'parameters', 'tag']

使用以下代码:

import yaml

with open(r'/Users/.../example.yml') as file:
    documents = yaml.full_load(file)

    a_list = []
    for item, doc in documents.items():
        a_list.extend(doc)
    res = list(set(a_list))
    res.sort()
    print(res)

我正在努力扩展脚本以获得 parameters 元素下方的以下有序唯一列表:

['basketball', 'cricket', 'football', 'hockey', 'rugby', 'soccer', 'swimming', 'table tennis']

提前感谢您的任何建议!

我可以通过迭代 parameters 键 -

得到这个
import yaml

with open(r'example.yaml') as file:
    documents = yaml.full_load(file)

    a_list = []
    a_vals=[]
    for item, doc, in documents.items():
        for val in doc['parameters']:
            a_vals.append(val)
        a_list.extend(doc)
    res = list(set(a_list))
    res.sort()
    a_vals=list(set(a_vals))
    a_vals.sort()
    print(a_vals)
    print(res)

输出-

python.exe "pysuperclass.py"
['basketball', 'cricket', 'football', 'hockey', 'rugby', 'soccer', 'swimming', 'table tennis']
['assets', 'examples', 'parameters', 'tag']

不需要中间列表,直接添加到集合即可。

import yaml

with open("example.yml") as fh:
    documents = yaml.full_load(fh)    
    params = set()
    for key in documents.keys():
        params.update(documents[key]["parameters"])
    print(sorted(params))