File IO Issues, help :(

[Peter Otten]

Kevin K wrote:

> On Apr 29, 12:38 am, "Eric Wertman" <ewert... at gmail.com> wrote:
>> chuck in a jsfile.close().  The buffer isn't flushing with what you
>> are doing now.  jsfile.flush() might work... not sure.  Closing and
>> re-opening the file for sure will help though.
>>
> 
> Yeah sorry I forgot to include the close() in the quote but its there.
> In fact I moved it up a bit and still no luck heres the new code:
> 
> jsfile = open("../timeline.js", "r+")
> jscontent = jsfile.readlines()
> jsfile.truncate()
> 
> for line in jscontent:
> if re.search('var d =', line):
> line = "var d = \""+mint['1'].ascdate()+"\"\n"
> print line
> jsfile.write(line)
> jsfile.close()
> 
> I tried this can got the same result...??

"""
truncate(...)
    truncate([size]) -> None.  Truncate the file to at most size bytes.

    Size defaults to the current file position, as returned by tell().
"""

After the readlines() call the current file position is at the end of the
file. Try jsfile.truncate(0).

Also note that readlines() reads the whole file into memory. For large files
it would therefore be better to write to a new file and rename it
afterwards.

Peter