python操作环境变量

使用os.environ来读取和修改环境变量：

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：

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()