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find string in file

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find string in file

 
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  #1
Mar 14th, 2008
Hi friends !!

I'm neophite about python, my target is to create a programa that
find a specific string in text file.
How can do it?


Thanks
fel
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Re: find string in file

 
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  #2
Mar 14th, 2008
The simplest way, but maybe not the most efficient for large files, is this:
python Syntax (Toggle Plain Text) 
  1. # sample text for testing
  2. # could come from a text file read like this:
  3. """
  4. infile = open("my_text.txt","r")
  5. text = infile.read()
  6. infile.close()
  7. """
  8.  
  9. text = """\
  10. My name is Fred Flintstone and I am a famous TV
  11. star.  I have as much authority as the Pope, I
  12. just don't have as many people who believe it.
  13. """
  14.  
  15. search = "Fred"
  16. index = text.find(search)
  17. print search, "found at index", index
  18.  
  19. """
  20. my ouput (index is zero based) -->
  21. Fred found at index 11
  22. """
Note that find() only finds the first occurrence of the search word!
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Re: find string in file

 
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  #3
Mar 14th, 2008
FWIW this will find all occurrences of a word in a string. Also note that if you are looking for "the" it will give a hit for "then". If you only want the word, you have to search with spaces added, " the " -assuming string.lower() and that punctuation is removed
Python Syntax (Toggle Plain Text) 
  1. found=the_string.find(word)
  2. while found > -1:
  3.      print word, "found at location", found
  4.      found=the_string.find(word, found+1)
Last edited by woooee; Mar 14th, 2008 at 7:33 pm.
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  #4
17 Days Ago
I kinda have the sane problem, but i want to extract the text ocr several lines.. not just a word...
Can somone tell me how to use a RE for this?
Thanks!
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16 Days Ago
You should really start a new thread of your own!

The string function find() can find a subtext within a larger text, as will re.findall(). The advantage of find() is that it will give you the location in the form of an index.
Last edited by vegaseat; 16 Days Ago at 12:05 pm.
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Originally Posted by vegaseat View Post
You should really start a new thread of your own!

The string function find() can find a subtext within a larger text, as will re.findall(). The advantage of find() is that it will give you the location in the form of an index.
Thanks, but i'm a bit unsure on using the index since the length of data tends to change within the search area...

And sorry about not starting a new thread... cos in another hobby forum that i'm part of we try to post questions in a thread thats already started with a similar question so that other readers can also look back on the old answer.. i guess it depends on the forum

Thanks again guys. i'm new to DaniWeb and am loving it here! you guys are amazingly helpful!!!
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16 Days Ago
Ah, the pros and cons on posting on an old thread.
If you are interested in a regex solution, I would start a new thread and put regex in the title.
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16 Days Ago
A friend just gave me a basic (not very professinal, but easy to move around) solution... trying that out... if it doesnt work, i sure will throw the problem at you guys again
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