regular expression concatenation with strings

[Jacek Trzmiel]

Hi,

oscartheduck wrote:
> I have a little script that sits in a directory of images and, when
> ran, creates thumbnails of the images. It works fine if I call the
> function inside the program with something like "thumbnailer("jpg),
> but I want to use a regular expression instead of a plain string so
> that I can match jpeg, jpg, JPEG etc.

Something like this will work:

#!/usr/bin/env python
#from PIL import Image
import glob, os, re

size = 128, 128


def thumbnailer(dir, filenameRx):
     for picture in [ p for p in os.listdir(dir) if 
os.path.isfile(os.path.join(dir,p)) and filenameRx.match(p) ]:
         file, ext = os.path.splitext(picture)
         im = Image.open (picture)
         im.thumbnail(size, Image.ANTIALIAS)
         im.save(file + ".thumbnail." + extension)


jpg = re.compile(".*\.(jpg|jpeg)", re.IGNORECASE)
thumbnailer(".", jpg)


Best regards,
Jacek.