Newbie help - Programming the Semantic Web with Python
Bruce Whealton
bruce at whealton.info
Sat Jul 16 21:35:22 EDT 2011
Hello,
So, regarding the path that python uses to find modules, I read
the link that you sent. Suppose, I open IDLE and start an interactive
session. That would mean the input script location is wherever python is
installed, correct? I did add an environment variable PYTHONPATH which did
not even exist when I first installed Python. I figured I would want to
have a directory where I could store modules that might interest me. I
might want to expand that into a package style path later.
Now, if I was going to create an application to run on the web, I
guess those included modules would have to get compiled with the rest of the
code for it to work, right?
Bruce
-----Original Message-----
From: Chris Angelico
Sent: Saturday, July 09, 2011 10:10 PM
To: python-list at python.org
Subject: Re: Newbie help - Programming the Semantic Web with Python
On Sun, Jul 10, 2011 at 11:32 AM, Bruce Whealton <bruce at whealton.info>
wrote:
problem with is this line:
> def add(self, (sub, pred, obj)):
> I think the problem is with the parentheses before the sub. I removed
> those and that seemed to fix that error or make it go away. I don’t
> remember how I figured that out, It should be on the Errata page for
> sure.
> Then it has a problem with this line:
> print list(g.triples((None, None, None)))
> If I was using python 3, it would require () around the thing that is
> going to be printed, right? Maybe python 2.7 doesn’t like this line for
> the same reason.
>
The issue there is with tuple unpacking. To match the older syntax,
don't touch the call, but change the definition thus:
def add(self, args):
(sub, pred, obj)=args
Or, of course, simply list the arguments directly, rather than in a
tuple; but that requires changing every call (if it's a small program
that may not be a problem).
You're right about needing parentheses around the print() call; in
Python 2 it's a statement, but in Python 3, print is a function like
any other.
Regarding the module search path, this may help:
http://docs.python.org/dev/tutorial/modules.html#the-module-search-path
Chris Angelico
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