[Tutor] Importing and creation on the fly

[Tino Dai]

On 6/26/07, Dave Kuhlman <dkuhlman at rexx.com> 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
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