Reading/Writing files

[Westley Martínez]

On Fri, 2011-03-18 at 15:56 -0600, Jon Herman wrote:
> Jack,
> 
> thanks.
> 
> Alright, so what I did is create a file called hello.txt with a single
> line of text in there. I then did the following:
> 
> f="fulldirectory\hello.txt" (where fulldirectory is of course the
> actual full directory on my computer)
> open("f", "w")
> 
> And I get the following error: IOError: [Errno 13] Permission denied:
> 'f'
> If I open to read, I get: IOError: [Errno 2] No such file or
> directory: 'f'
> 
> Can anyone explain to me why this happens?
> 
> 
> 
> 
> On Fri, Mar 18, 2011 at 3:50 PM, Jack Trades
> <jacktradespublic at gmail.com> wrote:
>         
>         
>         On Fri, Mar 18, 2011 at 4:33 PM, Jon Herman
>         <jfc.herman at gmail.com> wrote:
>                 Hello all,
>                 
>                 I am pretty new to Python and am trying to write data
>                 to a file. However, I seem to be misunderstanding how
>                 to do so. For starters, I'm not even sure where Python
>                 is looking for these files or storing them. The
>                 directories I have added to my PYTHONPATH variable
>                 (where I import modules from succesfully) does not
>                 appear to be it.
>                 
>                 So my question is: How do I tell Python where to look
>                 for opening files, and where to store new files?
>                 
>                 Thanks,
>                 
>                 Jon
>                 
>         
>         
>         By default Python will read and write files from the directory
>         that your program is run from.  This cannot always be relied
>         upon though (for instance if your program was imported as a
>         module from another program).
>         
>         To find out what directory your program is currently in use
>         os.getcwd().  Here's an example I just ran...
>         
>         >>> import os
>         >>> os.getcwd()
>         '/media/DATA/code/lispy/liSpy'
>         
>         The folder that is returned from os.getcwd() is the folder
>         that "open" will use.  You can specify another folder by
>         giving the full path.
>         
>         open("/full/path/to/file.txt", "w")
>         
>         PYTHONPATH is for importing modules, which is a separate
>         concern.
>         
>         -- 
>         Jack Trades
>         Pointless Programming Blog
>         
> 
Don't put f in quotes. That would just make the string literal 'f'.