>>> from virtualenvcontext import VirtualenvContext

>>> try:
>>>     import kitchen
>>> except ImportError as e:
>>>     print "kitchen is definitely not installed in system-python"

>>> with VirtaulenvContext("my-venv"):
>>>     import kitchen
>>>     print "But it *is* installed in my virtualenv"

>>> try:
>>>     import kitchen
>>> except ImportError as e:
>>>     print "But once I exit that block, I lose my powers again..."