Raymond Hettinger wrote:
> Separating the two cases is essential. Also, the wording should
contain strong
> cues that remind you of addition and of building a list.
>
> For the first, how about addup():
>
> d = {}
> for word in text.split():
> d.addup(word)
import copy
class safedict(dict):
def __init__(self, default=None):
self.default = default
def __getitem__(self, key):
if not self.has_key(key):
self[key] = copy.copy(self.default)
return dict.__getitem__(self, key)
text = 'a b c b a'
words = text.split()
counts = safedict(0)
positions = safedict([])
for i, word in enumerate(words):
counts[word] += 1
positions[word].append(i)
print counts, positions
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