Python Dict problems
Max M
maxm at mxm.dk
Tue Feb 3 05:57:15 EST 2004
venu gopal wrote:
> iam finding great difficulty in handling a two-dimentional dictionary or
> any other similar data structure for the following purpose:
> from a collection of words,i need to have the count of each word so if i
> use:
> str=f.getline()
> for l in range(flen):
> if subs[l].has_key(str):
> subs[l][str]=1
> else:
> subs[l][str]+=1
If it is a smalish file::
content = f.read()
result = {}
for word in words:
result[word] = content.count(word)
For big files::
result = {}
for l in f:
for word in words:
result[word] = result.get(word, 0) + l.count(word)
There are probably faster methods using re, where the counting is done
by the reg-ex engine.
regards Max M
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