>>> import os; print os.environ['MYENVVAR']
Traceback (most recent call last):
  File "/usr/lib/epiphany/2.18/extensions/console.py", line 275, in run
    exec cmd in self.namespace
  File "<string>", line 1, in ?
  File "/usr/lib/python2.4/UserDict.py", line 17, in __getitem__
    def __getitem__(self, key): return self.data[key]
KeyError: 'MYENVVAR'