File handling problem.

[SUBHABRATA BANERJEE]

Dear Sir,
Thanx for your prompt reply, I would be trying to work on your suggestion
and get back to you as soon as possible.
Best Regards,
Subhabrata.

On Sun, May 3, 2009 at 10:47 PM, Chris Rebert <clp2 at rebertia.com> wrote:

> On Sun, May 3, 2009 at 9:51 AM, SUBHABRATA BANERJEE
> <subhakolkata1234 at gmail.com> wrote:
> > Dear Group,
> >
> >
> >
> > I am working on a code like the following:
> >
> >
> >
> > from decimal import*
> >
> > #SAMPLE TEST PROGRAM FOR FILE
> >
> > def sample_file_test(n):
> >
> >     #FILE FOR STORING PROBABILITY VALUES
> >
> >     open_file=open("/python26/Newfile1.txt","r+")
>
> Is there a reason you must output the results to the same file the
> input came from? It's possible this is part of your problems.
>
> >
> >     #OPENING OF ENGLISH CORPUS
> >
> >     open_corp_eng=open("/python26/TOTALENGLISHCORPUS1.txt","r")
> >
> >     #READING THE ENGLISH CORPUS
> >
> >     corp_read=open_corp_eng.read()
> >
> >     #CONVERTING THE CORPUS FILE IN WORDS
> >
> >     corp_word=corp_read.split()
> >
> >     #EXTRACTING WORDS FROM CORPUS FILE OF WORDS
> >
> >     for word in corp_word:
> >
> >         #COUNTING THE WORD
> >
> >         count1=corp_word.count(word)
>
> Note: Your program is currently O(N^2) rather than O(N) because you
> re-count the number of occurrences of each word /on every occurrence
> of the word/.
>
> >         #COUNTING TOTAL NUMBER OF WORDS
> >
> >         count2=len(corp_word)
> >
> >         #COUNTING PROBABILITY OF WORD
> >
> >         count1_dec=Decimal(count1)
> >
> >         count2_dec=Decimal(count2)
> >
> >         getcontext().prec = 6
> >
> >         prob_count=count1_dec/count2_dec
> >
> >         print prob_count
> >
> >         string_of_prob_count=str(prob_count)
> >
> >         file_input_val=open_file.write(string_of_prob_count)
> >
> >         open_file.close()
>
> You shouldn't be closing the file until the /entire loop/ has finished
> writing to the file. So the previous line should be dedented.
>
> >
> >
> >
> > The problems I am getting:
> >
> > (i)                  The probability values are not being stored properly
> in
> > file.
>
> Also, you're currently not putting any separator between consecutive
> entires, so it's all going to run together as one long line.
> Have you considered using one of the std lib modules to output the
> file in a well-defined human-readable format such as JSON or CSV?
>
> > (ii)                “Newfile1.txt” is storing not the series of values
> but
> > an arbitrary value from series 0.00000143096
> >
> > (iii)               As I was testing it again it gave me another error
> >
> > Traceback (most recent call last):
> >
> >   File "<pyshell#2>", line 1, in <module>
> >
> >     sample_file_test(1)
> >
> >   File "C:\Python26\testprogramforfiles1.py", line 25, in
> sample_file_test
> >
> >     file_input_val=open_file.write(string_of_prob_count)
> >
> > ValueError: I/O operation on closed file
>
>
> Cheers,
> Chris
> --
> http://blog.rebertia.com
>
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