[Tutor] filelist

[Dave Angel]

On 08/04/2012 09:11 PM, richard kappler wrote:
> Starting to work through "Programming Computer Vision with Python" in my
> -summer of learning python- quest. 

Congratulations;  that's a worthy goal.

>  As I read through the intro to the PIL
> library, I came across the below code.  When I read it, I said to my self
> "I don't see how that calls a set of files, there's no specificity.  How
> does that know where to call from?"  Then I convinced myself that, because
> I'm a beginner, I must be missing something, and ran it through the
> interpreter.  Of course, I got an error message telling me filelist isn't
> defined.  But now I'm kinda lost.
>
> If the directory holding the pics I want to work on is called
> practicephotos, should I declare something along the lines of filelist =
> ~/practicephotos/ or what?
>
> regards, Richard
>
> [code]
> from PIL import Image
> import os
>
> for infile in filelist:
> outfile - os.path.splitext(infile)[0] + ".jpg"
> if infile != outfile:
> try:
> Image.open(infile).save(outfile)
> except IOError:
> print "cannot convert", infile
> [/code]
>
>

As you have realized, the code is incomplete. The loop is expecting
filelist to be already initialized to a list of strings, with each
string being a filename.

One way to get such a list (from the commandline) would be to use

import sys
filelist = sys.argv[1:]

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text.  The indentation of your html message is lost in the plain text
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-- 

DaveA