Paul McNett wrote:
> Ed Leafe wrote:
>
>> On Jan 15, 2008, at 3:39 PM, Jeff Johnson wrote:
>>
>>> Thank Ed. But it IS a file object so I can pass it to:
>>>
>>> cp = ConfigParser.ConfigParser()
>>> cp.readfp(f)
>>>
>>> Right? It appears to work fine.
>>
>> If you open it for write, it should be a zero-byte file. You would
>> normally open the file for read (i.e., no parameter) before passing
>> it to something that needs to read it.
>
> AFAIK (but test it for yourself at the command line), you either open
> files read-only or write-only. IOW, if I open a file with 'w', I can
> write to it but not read from it. I just tried that and got an exception
> trying to read from it 'bad file descriptor'.
>
> If you want to open up a file to write to without first erasing its
> contents, you use 'w+' mode.
Oops, back to Python 101 for me:
open("test", "r") -> read-only
open("test", "w") -> write-only
open("test", "w+") -> read/write
open("test", "a") -> append-only
open("test", "a+") -> append/read
There are additional mode codes, such as 'b' which tells it not to
automatically add newlines, which is usually what you want.
Paul
--
http://paulmcnett.com
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