On 6/26/07, Tino Dai <[EMAIL PROTECTED]> wrote:
On 6/26/07, Dave Kuhlman <[EMAIL PROTECTED]> wrote:
> On Tue, Jun 26, 2007 at 12:20:18PM -0400, Tino Dai wrote:
> > Hi there,
> >
> > I've been banging my head on this for about two weeks, and I can't
> > figure out a solution to this. I'm wondering if you could assist me on
> this
> > pesky problem.
> >
> > I'm reading in an xml file that has the name of class, location,
> and
> > the filename into a dictionary. I want to import these classes and
> create
> > instances of them. The code in question is as follows:
> >
> > 36 for xmlKey in self.dictXML.keys():
> > 37 if not self.dictXML[xmlKey]['location'] in sys.path and
> \
> > 38 not self.dictXML[xmlKey]['location'] == os.getcwd():
> > 39 sys.path.append(self.dictXML[xmlKey]['location'])
> > 40 try:
> > 41 if os.stat(self.dictXML[xmlKey]['location'] + \
> > 42 self.dictXML[xmlKey]['filename']):
> > 43 eval('import ' + self.dictXML[xmlKey]["class"])
> > <-- syntax error here
> > 44 actionStmt=self.dictXML [xmlKey]["class"] + '.'
> +
> > self.dictXML[xmlKey]["class"] + '()' 45
> > 45 self.objList.append(eval(actionStmt))
> > 46 except:
> > 47 pass
> >
> >
> > I have also tried: __import__(self.dictXML[xmlKey]["class"]), which
> gave me
> > an error when I did the eval(actionStmt). Could anybody shed some
> light on
> > this? Thanks in advance.
>
> For the task of importing, look at the "imp" module:
>
> http://docs.python.org/lib/module-imp.html
>
> Also, the "inspect" module may be of help:
>
> http://docs.python.org/lib/module-inspect.html
>
> In particular, look at the the inspect.getmembers() and
> inspect.isclass() methods.
>
> Dave
Thanks guys. I will look into that this afternoon
-Tino
Hi Everybody,
This is the solution that I came up with. Using Dave's advice:
fp, pathname, description = imp.find_module(self.dictXML
[xmlKey]["class"])
tarMod = imp.load_module('apacheLimiter',fp,pathname,description)
tarClass = getattr(tarMod,self.dictXML[xmlKey]["class"])
tarObj=tarClass()
if hasattr(tarObj,'do'):
self.objList.append(tarObj)
So, I used the find_module to find the particular module that I
wanted, returning the filename, path to the module, and the description (see
the docs.python.org for more info). Next, I loaded the module from the info
provided to me. After loading the module, I "extracted" the class that I
wanted using the getattr function. After I had the class loaded, I created
an instance from it.
I also checked out the exec function Kent. And one of my colleagues
recommended execfile. I felt like that was "hack" to get around a problem
(IHMO). Thanks for everything.
-Tino
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