[Tutor] Addressing a variable whose name is the value of a string

[Andreas Pfrengle]

Kent Johnson wrote:

> Andreas Pfrengle wrote:
>
>> # Accessing db (see http://www.djangoproject.com/documentation/db-api/):
>> myobj = MyModel.objects.get(<some filter>)
>> var = myobj.vector
>> # vector is a Textfield, so var now contains a string, naming another 
>> db-field of myobj
>>
>> execstr = "attr = myobj." + var
>> exec execstr
>> # attr now contains the content of the field named in var (an int in 
>> my case)
>
>
> Use
> attr = getattr(myobj, var)
>
>> attr += 42    #some calculation with attr
>>
>> execstr = "myobj." + var + " = attr"
>> exec execstr
>
>
> setattr(myobj, var, attr)
>
> Kent
>
Thanks Kent, I've just looked up getattr and setattr, and since they 
take strings for the addressed attributes, this really seems to be the 
optimal solution! :)