使用os.environ来读取和修改环境变量：

复制代码 代码如下:
import os

print (os.environ[\”TEMP\”])

mydir = \”c:\\\\mydir\”
os.environ[\”MYDIR\”] = mydir
print (os.environ[\”MYDIR\”])

pathV = os.environ[\”PATH\”]
print (pathV)
os.environ[\”PATH\”]= mydir + \”;\” + os.environ[\”PATH\”]
print (os.environ[\”PATH\”])

自定义的python的环境变量类：

复制代码 代码如下:
import os

class MyEnv:

  def __init__(self):
    self.envFile = \”c:\\\\myenv.txt\”
    self.envs = {}
 
  def SetEnvFile(self, filename) :
    self.envFile = filename
       
  def Save(self) :
    outf = open(self.envFile, \”w\”)
    if not outf:
      print (\”env file cannot be opened for write!\”)
    for k, v in self.envs.items() :
      outf.write(k + \”=\” + v + \”\\n\”)
    outf.close()
   
  def Load(self) :
    inf = open(self.envFile, \”r\”)
    if not inf:
      print (\”env file cannot be opened for open!\”)
    for line in inf.readlines() :
      k, v = line.split(\”=\”)
      self.envs[k] = v
    inf.close()
   
  def ClearAll(self) :
    self.envs.clear()
   
  def AddEnv(self, k, v) :
    self.envs[k] = v
   
  def RemoveEnv(self, k) :
    del self.envs[k]
   
  def PrintAll(self) :
    for k, v in self.envs.items():
      print ( k + \”=\” + v )
  
if __name__ == \”__main__\” :
  myEnv = MyEnv()
  myEnv.SetEnvFile(\”c:\\\\myenv.txt\”)
  myEnv.Load()
  myEnv.AddEnv(\”MYDIR\”, \”c:\\\\mydir\”)
  myEnv.AddEnv(\”MYDIR2\”, \”c:\\\\mydir2\”)
  myEnv.AddEnv(\”MYDIR3\”, \”c:\\\\mydir3\”)
  myEnv.Save()
  myEnv.PrintAll()