Re: Python Dict problems

From: Max M (maxm_at_mxm.dk)
Date: 02/03/04 

Date: Tue, 03 Feb 2004 11:57:15 +0100
To: venu gopal <madhuananth@hotmail.com>

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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