Referrer key missing form os.environ dictionary?

[Ned Batchelder]

On 9/25/13 10:26 AM, John Gordon wrote:
> You could try this:
>
>      try:
>          referer = os.environ.get('HTTP_REFERER', 'UnknownRef')
>      except KeyError:
>          referer = None
>
>      if not referer:
>          referer = 'UnknownRef'
There's no need for the "except KeyError" clause.  dict.get never raises 
KeyError, this code will assign 'UnknownRef' in the case the environment 
variable is missing.

--Ned.