python3 读取配置文件中的参数值替换yaml文件中的占位符（变量）

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