Python读取和存储yaml文件 Python读取和存储yaml文件的方法
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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:许多电子邮件标题格式和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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