How to set environment variables in Python?

Question

I need to set some environment variables in the Python script and I want all the other scripts that are called from Python to see the environment variables\' set.

If

Answer 1

You can use the os.environ dictionary to access your environment variables.

Now, a problem I had is that if I tried to use os.system to run a batch file that sets your environment variables (using the SET command in a **.bat* file) it would not really set them for your python environment (but for the child process that is created with the os.system function). To actually get the variables set in the python environment, I use this script:

import re
import system
import os

def setEnvBat(batFilePath, verbose = False):
    SetEnvPattern = re.compile("set (\w+)(?:=)(.*)$", re.MULTILINE)
    SetEnvFile = open(batFilePath, "r")
    SetEnvText = SetEnvFile.read()
    SetEnvMatchList = re.findall(SetEnvPattern, SetEnvText)

    for SetEnvMatch in SetEnvMatchList:
        VarName=SetEnvMatch[0]
        VarValue=SetEnvMatch[1]
        if verbose:
            print "%s=%s"%(VarName,VarValue)
        os.environ[VarName]=VarValue