[mark@toy ~/PP2ndEd/dev/examples/Part1/Preview/Integrate]$ python
>>> import os
>>> from envsub2 import Env
>>> os.environ['USER']
'mark'
>>> Env.get('USER')
'mark'
>>> Env.put('USER', 'professor')
>>> os.environ['USER']
'professor'
>>> Env.get('USER')
'professor'

# cenviron names don't work

>>> Env.getenv('USER')
'professor'
>>> Env.putenv('USER', 'skipper')
>>> Env.getenv('USER')
'skipper'
>>> os.environ['USER']
'professor'