Testing existance of variable

[Aahz Maruch]

In article <z%iG5.584$7u4.12229 at news.dircon.co.uk>,
Steve George  <python-group at rascal.remove_this_bit.org> wrote:
>
>Thanks Alex - that's just the operation I wanted. According to the Quick
>Python Book I can also use it to provide a default in case the environment
>doesn't have that variable:
>
>remote_id = os.environ.get('REMOTE_HOST') or \
>			os.environ.get('REMOTE_ADDR', 'empty')

Well, yes, but you probably want the standard default of None instead of
'empty'.
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