[Tutor] Script to search in string of values from file A in file B

[Joel Goldstick]

On Wed, May 9, 2012 at 3:40 PM, Joel Goldstick <joel.goldstick at gmail.com> wrote:
> On Wed, May 9, 2012 at 10:00 AM, Afonso Duarte <aduarte at itqb.unl.pt> wrote:
>> Dear All,
>>
>>
>>
>> I’m new to Python and started to use it to search text strings in big
>> (>500Mb) txt files.
>>
>> I have a list on text file (e.g. A.txt) that I want to use as a key to
>> search another file (e.g. B.txt), organized in the following way:
>>
>>
>>
>> A.txt:
>>
>>
>>
>> Aaa
>>
>> Bbb
>>
>> Ccc
>>
>> Ddd
>>
>> .
>>
>> .
>>
>> .
>>
>>
>>
>> B.txt
>>
>>
>>
>> Bbb
>>
>> 1234
>>
>> Xxx
>>
>> 234
>>
>>
>>
>>
>>
>> I want to use A.txt to search in B.txt and have as output the original
>> search entry (e.g. Bbb) followed by the line that follows it in the B.txt
>> (e.g.  Bbb / 1234).
>>
>> I wrote the following script:
>>
>>
>>
>>
>>
>> object = open(B.txt', 'r')
>>
>> lista = open(A.txt', 'r')
>>
>> searches = lista.readlines()
>>
>> for line in object.readlines():
>>      for word in searches:
>>           if word in line:>
>>                print line+'\n'
>>
>>
>>
>
> Don't give up on this group so quickly.  You will get lots of help here.
>
> As to your problem:  Do you know about enumerate?  Learn about it
> here: http://docs.python.org/library/functions.html#enumerate
>
> if you change your code above to:
>   for index, word in enumerate line:
>       print line, word[index+1]
>
> I think you will get what you are looking for

My mistake :  I meant this:
  my_lines = object.readlines()  # note, not a good thing to name
something object. Its a class
  for index, line in enumerate(my_lines):
      for word in searches:
           if word in line:
                print line
                print my_lines[index+1]

Sorry for the crazy earlier post

>>
>> But from here I only get the searching entry and not the line afterwards, I
>> tried to google it but I got lost and didn’t manage to do it.
>>
>> Any ideas ? I guess that this is basic scripting but I just started .
>>
>>
>>
>> Best
>>
>>
>>
>> Afonso
>>
>>
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>
>
>
> --
> Joel Goldstick



-- 
Joel Goldstick