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These are just some notes about working with processes in Python.

The module of interest is os. (os module documentation)

Environment variables are accessed through a dictionary, os.environ.

Processes are created with os.popen, described in os 6.1.2. 

   1 import os
   2 
   3 # Export an environment variable
   4 os.environ["FOO"] = "BAR"
   5 
   6 # Make sure environment variable set for child processes
   7 for line in os.popen("bash -c 'env'").read().splitlines():
   8     if line.startswith("FOO="):
   9         print line
  10 
  11 # Since environment variable "FOO" is exported, and since child
  12 # processes inherit environment variables from their parents, this
  13 # works.