python3 读取配置文件中的参数值替换yaml文件中的占位符（变量）

àì夳堔傛蜴生んèń 2023-10-05 15:16 30阅读 0赞

### 要替换内容的yaml文件：temp.yaml ###

> 也就是要将`"$$PLACEHOLDER$$"`进行替换。

---
    applications:
    - name: $$NAME$$-$$DATETIME$$-$$VERSION$$
      memory: 2048m
      instances: 1
      disk_quota: 2048m
    ################## ==================================================
      env:
         APP_ID: "$$PLACEHOLDER$$"
         TABLE_KEY: "$$PLACEHOLDER$$"
         SECURITY: "$$PLACEHOLDER$$"
         KEY: "$$PLACEHOLDER$$"

### 参数值配置文件：env ###

APP_ID=11111111111
    TABLE_KEY=22222222222
    SECURITY=3333333333333
    KEY=6777777777777

### python代码 ###

import sys, os
    from contextlib import ExitStack
    profileList = {
        }
    def PropValue(envfile):
        with open(envfile) as profile:
            new_profile = profile.readlines()
            print(new_profile)
            for line in new_profile:
                line_key = line.strip().split("=", 1)[0];
                profileList[line_key] = line.strip().split("=", 1)[1]
    def EnvReplaceYaml(yamlfile, newyamlfile):
        try:
            with ExitStack()  as stack:
                yml_file = stack.enter_context(open(yamlfile,'r+'))
                yml_output = stack.enter_context(open(newyamlfile,'w'))
                yml_file_lines = yml_file.readlines()
                for line in yml_file_lines:
                    new_line = line
                    if (new_line.find('$$PLACEHOLDER$$') > 0):
                        env_list = new_line.split(':')
                        env_name = env_list[0].strip()
                        replacement = ""
                        if env_name in profileList.keys():
                            replacement = profileList[env_name];
                        new_line = new_line.replace('$$PLACEHOLDER$$', replacement)
                    yml_output.write(new_line)
        except IOError as e:
            print("Error: " + format(str(e)))
            raise
    
    if __name__ == "__main__":
        PropValue('env')
        EnvReplaceYaml('temp.yaml', 'newtemap.yaml')

### 运行结果 ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2E3NzIzMDQ0MTk_size_16_color_FFFFFF_t_70]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2E3NzIzMDQ0MTk_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20201208141452905.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2E3NzIzMDQ0MTk=,size_16,color_FFFFFF,t_70