Reading/Writing files

[Jon Herman]

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 <http://pointlessprogramming.wordpress.com>
>
>
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