简介

在实际开发过程中,我们可能需要读取一些配置文件的配置信息,例如ini、yaml、property等格式,本文将讲述怎么去获取和设置yaml文件的相关参数。

示例yaml文件

test1:
  test2-1: 5
  test2-2: 130000
  test2-3: 
    test3-1: 123
    test3-2: 256

使用到的模块

pip3 install PyYAML

读写yaml文件

import yaml, os, json


class YamlUtil():
    
    def __init__(self, yaml_path):
        self.yaml_path = yaml_path

    def get_yml_data(self, is_modify=False, *key_names):
        """
        读取yaml配置文件并根据对应层级的key获取对应的value
        适用于两层数据
        :param: key_names: 需要查询的yaml文件的key关键字,从左向右依次
        :return: result: 根据key值返回对应value,不传key则直接返回所有, 没有对应key则返回None
        """
        with open(self.yaml_path, "r", encoding="utf-8") as f:
            content = f.read()
        yaml_content = yaml.safe_load(content)
        if is_modify:
            return yaml_content
        try:
            for key_name in key_names:
                yaml_content = yaml_content.get(key_name, None)
            return yaml_content
        except Exception as e:
            print(f"get_yml_data error:{e}")
            return None

    def set_yaml_data(self, value, *key_names):
        """
        设置yaml文件中的相关属性
        :param: value:修改后的值
        :param: key_names: 需要修改的yaml文件的key关键字,从左向右依次
        """
        yaml_content = self.get_yml_data(True, key_names)
        print(f'yaml_content:before:{yaml_content}')
        key_name = ''
        for item in list([[item] for item in key_names]):
            key_name += str(item)
        print(f'key_name:{key_name}')
        command = "yaml_content" + key_name + '=' + str(value)
        print(f'command:{command}')
        # exec:将字符串转换成python代码执行
        exec(command)
        print(f'yaml_content:after:{yaml_content}')
        with open(self.yaml_path, mode='w', encoding='utf-8') as f:
            f.write(yaml.safe_dump(yaml_content))
        


if __name__ == '__main__':
    YAML_PATH = os.path.join(os.path.dirname(__file__), 'test.yaml')
    yamlUtil = YamlUtil(YAML_PATH)
    print(yamlUtil.get_yml_data("test1", "test2-1"))
    print(yamlUtil.get_yml_data("test1", "test2-3", "test3-1"))
    yamlUtil.set_yaml_data(123, "test1", "test2-1")
    yamlUtil.set_yaml_data(111, "test1", "test2-3", "test3-1")

获取属性采用的是将数据读取出来成字典,然后直接取出对应属性即可,设置属性采用的是读取原有数据,使用字典更新对应值的方式,不过是采用exec执行拼接的字符串方式。

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