Unsubscriptable object when using Exec

Indian write2abdul at gmail.com
Sat Nov 15 06:39:51 CET 2008


Thanks Chris!!

It worked.. Yeah my bad i was trying out the bad logic :)

On Sat, Nov 15, 2008 at 5:31 AM, Chris Rebert <clp at rebertia.com> wrote:

> On Fri, Nov 14, 2008 at 10:40 AM, Indian <write2abdul at gmail.com> wrote:
> > Hi Friends
> >
> > I'm getting the TypeError Unsubscriptable object when using Exec in a
> class
> >
> > Here's the example
> >
> > class Fake(object):
> >   def __init__(self, reg):
> >     self._reg = reg
> >
> >   def OpenKey(self, rootkey, path):
> >     open_key = self._reg
> >     path_string='[\'HKLM\']'
> >     for key in path.split('\\'):
> >       path_string += '[\'%s\']'%key
> >     a='d=open_key%s'%path_string
> >     exec(a)
> >     return d
> >
> > When i create a claassobject and call the method Openkey i get the above
> > error but it works fine in the below example without class
> >
> > def OpenKey(rootkey, path, reg):
> >   open_key = reg
> >   path_string='[\'HKLM\']'
> >   for key in path.split('\\'):
> >     path_string += '[\'%s\']'%key
> >   a='d=open_key%s'%path_string
> >   print a
> >   exec(a)
> >   return d
>
> You don't need and shouldn't be using `exec` here. It appears as
> though you're just doing the following in a much more obtuse and
> unnecessarily complicated manner:
>
> def OpenKey(rootkey, path, reg):
>     open_key = reg['HKLM']
>     for key in path.split('\\'):
>         open_key = open_key[key]
>    return open_key
>
> Lesson: Don't use `exec`.
> More importantly, what led you to think you needed to use it here in
> the first place?
>
> Cheers,
> Chris
> --
> Follow the path of the Iguana...
> http://rebertia.com
>
> >
> > What am i doing wrong in the class?Any thought on this would be helpful
> :)
> >
> > Thanks in Advance
> >
> > --
> > http://mail.python.org/mailman/listinfo/python-list
> >
>
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