YAML 是 "YAML Ain't a Markup Language"(YAML 不是一种标记语言)的递归缩写。在开发的这种语言时,YAML 的意思其实是:"Yet Another Markup Language"(仍是一种标记语言)。
YAML 的语法和其他高级语言类似,并且可以简单表达清单、散列表,标量等数据形态。它使用空白符号缩进和大量依赖外观的特色,特别适合用来表达或编辑数据结构、各种配置文件、倾印调试内容、文件大纲(例如:许多电子邮件格式和YAML非常接近)。
基本语法
大小写敏感
使用缩进表示层级关系
缩进不允许使用tab,只允许空格
缩进的空格数不重要,只要相同层级的元素左对齐即可
'#'表示注释
数据类型
YAML 支持以下几种数据类型:
对象:键值对的集合,又称为映射(mapping)/ 哈希(hashes) / 字典(dictionary)
数组:一组按次序排列的值,又称为序列(sequence) / 列表(list)
纯量(scalars):单个的、不可再分的值
关于yaml的简单介绍就到这里,今天需要用Python来读取/存储yml文件,废话补多少,直接看具体的操作:
#!usr/bin/env python
# encoding:utf-8
from __future__ import division
"""
__Author__:沂水寒城
功能: yaml 操作
"""
import sys
import yaml
def write2Yaml(data, save_path="test.yaml"):
"""
存储yaml文件
"""
with open(save_path, "w") as f:
yaml.dump(data, f)
def loadData(data="config.yaml"):
"""
加载yaml文件
"""
with open(data, "r") as f:
content = f.read()
yamlData = yaml.load(content)
print("yamlData_type: ", type(yamlData))
print("yamlData: ", yamlData)
return yamlData
if __name__ == "__main__":
data = {
"kind": "SeldonDeployment",
"spec": {
"name": "test-deployment",
"predictors": [
{
"graph": {
"endpoint": {"type": "REST"},
"type": "MODEL",
"name": "step_one",
"children": {
"endpoint": {"type": "REST"},
"type": "MODEL",
"name": "step_two",
"children": {
"endpoint": {"type": "REST"},
"type": "MODEL",
"name": "step_three",
"children": [],
},
},
},
"componentSpecs": [
{
"spec": {
"containers": [
{
"image": "seldonio/step_one:1.0",
"name": "step_one",
},
{
"image": "seldonio/step_two:1.0",
"name": "step_two",
},
{
"image": "seldonio/step_three:1.0",
"name": "step_three",
},
]
}
}
],
"name": "example",
"replicas": 1,
}
],
},
"apiVersion": "machinelearning.seldon.io/v1alpha2",
"metadata": {"name": "seldon-model"},
}
write2Yaml(data, save_path="test.yaml")
yamlData = loadData(data="test.yaml")
print(yamlData == data)
上述测试用的test.yaml文件如下:
apiVersion: machinelearning.seldon.io/v1alpha2
kind: SeldonDeployment
metadata:
name: seldon-model
spec:
name: test-deployment
predictors:
- componentSpecs:
- spec:
containers:
- image: seldonio/step_one:1.0
name: step_one
- image: seldonio/step_two:1.0
name: step_two
- image: seldonio/step_three:1.0
name: step_three
graph:
children:
children:
children: []
endpoint:
type: REST
name: step_three
type: MODEL
endpoint:
type: REST
name: step_two
type: MODEL
endpoint:
type: REST
name: step_one
type: MODEL
name: example
replicas: 1
在上述代码中可以看到我操作的yaml文件后缀都写的是yaml,其实写成yml也是可以的。如下所示:
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