Thanks for your help Kent
The error was that I was trying to assign to a non-assignable reference
as you highlighted. Everything works now
Thanks
Andy
Kent Johnson wrote:
> Andy Cheesman wrote:
>> for thing in ["top", "right", "bottom", "left"]:
>> eval("self." + thing).append("fish")
>
> You don't need to use eval() here, use getattr() instead:
> getattr(self, thing).append('fish')
>
>> eval("self." + thing +"_extra")
>> eval("self." + thing) = external_function(eval("self." + thing))
>> #This
>> falls
>
> It would help if you said *how* it fails - the specific error message
> and traceback. I guess it is failing on the left side of the assignment,
> not the function call. The result of eval("self." + thing) is the value
> of self.thing, not an assignable reference. You should use getattr() and
> setattr() here:
>
> new_value = external_function(getattr(self, thing))
> setattr(self, thing, new_value)
>
> or in one line if you like:
> setattr(self, thing, external_function(getattr(self, thing)))
>
> http://docs.python.org/lib/built-in-funcs.html
>
> Kent
>
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