readline()

Joshua Macy amused at webamused.com
Thu Mar 23 05:02:07 CET 2000


Dana Booth wrote:
> 
> I have a small proggie that reads through the mailspool, looking for lines
> containing keywords. If the mailbox contains mime encoded attachements, or
> for some other reason is very large, it seems to take quite a long time. The
> util uses readline() and the re.search.
> 
> Is readline() not very efficiant? I know that Perl is really the ticket for
> most text processing utils that require anything more than Awk, and in
> this case it's much faster, but the Python util goes on to do much more, and
> I didn't want to call on Perl just for a textfile read.
> 
> Anyway, I'm pretty new to Python, is there a better way to analyze
> textfiles? Or is the re.search slowing it down?
> 
> --
> -----
> Dana Booth <dana at mmi.oz.net>
> Tacoma, Wa., USA
> 
> key at pgpkeys.mit.edu:11371

  Depending on how big your file is, it might be quicker to suck the
whole thing into memory at once with readlines, e.g.:

for line in myFile.readlines():

 If the file is too big for that, you can provide a sizehint to
readlines (e.g. myFile.readlines(1000000)), that will tell Python to
only read about that many bytes at a gulp.

  Joshua



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