python環境文件打開加路徑

Question

在系統的環境變量中，我定義了兩個變量：

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

編寫以下腳本以從變量A的位置讀取信息，然后將其關閉，然后打開變量B的位置並將其寫入那里，這就是腳本僅適用於精確路徑的情況，例如

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

問題是，我需要python來讀取env變量中定義的路徑，再加上如下通用路徑：％a_home％\\ a \\ components \\ xxx \\ etc \\ static-data \\ myfile.xml`

到目前為止，我有這個，我不能繼續前進..任何人有任何想法嗎？ 該腳本僅讀取確切路徑...

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

嘗試這樣的事情：

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

終於成功了，謝謝湯姆，我的靈感來自你。

開始

 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()