Having trouble with file modes

[erikcw]

To make it write over the data, I ended up adding, which seems to work
fine.

f = open('_i_defines.php', 'w+')
data = f.read()
f.seek(0)
f.truncate(0)
...process data, write file, close...

Now that I look at it, I could probably take out the f.seek().

Thanks for your help!


On Nov 3, 4:00 pm, "martdi" <martin.d... at gmail.com> wrote:
> > At first I was convinced that "w+" was the tool for the job.  But now
> > I'm finding that the contents of the file are deleted (so I can't read
> > the data in).Possible File Modes:
> a : Append -- Add data at the end of the file
> r : Read -- Read from the file
> w : write -- Flush contents of the file and put data in it
> r+ : read and write -- Make changes to the file
> any of the above modes with b added at the end of the mode sets the
> file in binary mode
>
> you might want to check section 7.2 fromhttp://docs.python.org/tut/node9.html
>
> Ofen when doing file operations you might prefer to read the file to
> modify, make changes in memory then save back in an other file, so you
> can make sure the changes are ok before you replace the old one