python环境文件打开加上路径

Question

在系统的环境变量中，我定义了两个变量：

A_home=C:\install\ahome B_home=C:\install\bhome

下面的脚本是从变量A的位置读取信息，关闭它，然后打开变量B的位置并将其写在那里，脚本只适用于精确的路径，例如

C:\install\a\components\xxx\etc\static-data\myfile.xml
C:\install\b\components\xxx\etc\static-data\myfile.xml

问题是，我需要python来读取在环境变量中定义的路径，以及如下所示的公共路径：%a_home%\a\components\xxx\etc\static-data\myfile.xml`

到目前为止，我已经有了这个，我不能继续前进...谁有什么想法？？此脚本仅读取确切路径...

file = open('C:\install\a\components\xxx\etc\static-data\myfile.xml','r')
lines = file.readlines()
file.close()
file = open('C:\install\b\components\xxx\etc\static-data\myfile.xml','w')
for line in lines:
  if line!='</generic-entity-list>'+'\n':
    file.write(line)
file.write('<entity>XXX1</entity>\n')
file.write('<entity>XXX2</entity>\n')
file.write('</generic-entity-list>\n')
file.close()

Answer 1

尝试如下所示：

import os
import os.path

home = os.getenv("A_HOME")
filepath = os.path.join(home, "components", "xxx", "etc", "static-data", "GenericEntityList.xml")
with open(filepath, 'r') as f:
    for line in f:
        print(line)

Answer 2

所以终于成功了，感谢汤姆，我受到了你的启发……

开始吧

 import os
path1 = os.environ['SOME_ENVIRO1']
path2 = os.environ['SOME_ENVIRO2']
file = open(path1 +'\\components\\xxx\etc\\static-data\\GenericEntityList.xml', 'r')
lines = file.readlines()
file.close()
file = open(path2 +'\\components\\xxx\\etc\\static-data\\GenericEntityList.xml', 'w')
for line in lines:
  if line!='</generic-entity-list>'+'\n':
    file.write(line)
file.write('<entity>ENTITY1</entity>\n')
file.write('<entity>ENTITY2</entity>\n')
file.write('</generic-entity-list>\n')
file.close()