Python performance notes...

[Brett g Porter]

"Aahz Maruch" <aahz at netcom.com> wrote in message
news:8gjcc1$nam$1 at nntp9.atl.mindspring.net...
> So?  What's your point?  Try writing the following code in C:
>
> import re,sys
> f=open(sys.argv[1])
> s=f.read()
> f.close()
> words=re.split(s,r'\s')
> uniqWords = {}
> for word in words:
>   uniqWords[word] = 1
> for word in uniqWords.keys():
>   print word
>
> How long did it take you?  Did it run as fast as the Python code?  Was
> the overhead of the two loops here really a significant factor?

here it is in C++. Took me about the same amount of time it woulda taken me
to write it in Python, actually...
Your point is well taken, nonetheless...

// splitter.cpp : Defines the entry point for the console application.
//

#include <fstream>
#include <iostream>
#include <map>
#include <string>


using namespace std;

int main(int argc, char* argv[])
{
   ifstream f(argv[1]);

   string newWord;
   map<string, int> unique;

   while (f)
   {
      f >> newWord;
      unique[newWord]+= 1;
   }

   for (map<string, int>::iterator i = unique.begin();
   i != unique.end(); ++i)
   {
      cout << i->first << endl;
   }

    return 0;
}