try vs. has_key()

[Aahz Maruch]

I've seen roughly half the people here doing

try:
   dict[key].append(foo)
except:
   dict[key]=[foo]

with the other half doing

if dict.has_key(key):
   dict[key].append(foo)
else:
   dict[key]=[foo]

Can people explain their preferences?
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