用配置文件里面的參數值替換yaml模板中的變量值【python】

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Time    : 2019/9/20 15:44
# @Site    : 
# @File    : VarsubYaml.py
# @Software: PyCharm
"""
"""
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')

temp.yaml

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

env

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

原文中的nested已經在python3中棄用了，改為ExitStack

參考：https://www.cnblogs.com/husbandmen/p/8783232.html

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