Python: set a string to line x of theFile

Discussion in 'Mac Programming' started by lynkynpark86, Nov 29, 2011.

  1. macrumors 6502

    #1
    I'm making a program that reads and writes files for a specific purpose, and I need to be able to basically do this:
    Code:
    theString = theFile.line(2)
    
    to set theString to whatever text is on line 2 of theFile. Any suggestions?
     
  2. cm2
    macrumors newbie

    Joined:
    Nov 29, 2011
    #2
    If the file is not too large, then you can just read it into an array and then select the line you want:

    Code:
     theString = theFile.readlines()[x-1]
    Recall that this is zero-based indexing, hence the -1.
     
  3. thread starter macrumors 6502

    #3
    So for line 1 do x-0, and line 3, x-2?
     
  4. cm2
    macrumors newbie

    Joined:
    Nov 29, 2011
    #4
    No, if you want line number x, then just replace the x in the code with your line number. For example, if you want the 5th line of the file, set x=5 before the line I gave you.

    My comment about the -1 was just to note that line 1 of the file is actually index 0, line 2 is index 1, etc. of the list returned by readlines(). The index you want from the list will always be the line number you want minus 1.
     

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