> However incrementing a non-existing key throws an exception.
Right. And that's exactly what I would expect, according to the
"principle of least surprise" Python tries to obey. There's simply no
way to increment a non-existent value - not without performing some
obscure implict behind-the-scenes stuff.
> So you
> either have to use a workaround:
>
> >>> try:
> ... counter['B'] += 1
> ... except KeyError:
> ... counter['B'] = 1
Or you could simply use
if counter.has_key('B'):
counter['B'] += 1
else:
counter['B'] = 1
Regards,
Frank
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