Question

I have to write a testing module and have c++-Background. That said, I am aware that there are no pointers in python but how do I achieve the following:

I have a test method which looks in pseudocode like this:

def check(self,obj,prop,value):
    if obj.prop <> value:  #this does not work, 
                           #getattr does not work either, (objects has no such method (interpreter output) 
                           #I am working with objects from InCyte's python interface
                           #the supplied findProp method does not do either (i get 
                           #None for objects I can access on the shell with obj.prop
                           #and yes I supply the method with a string 'prop'
        if self._autoadjust:
            print("Adjusting prop from x to y")
            obj.prop = value #setattr does not work, see above
        else:
            print("Warning Value != expected value for obj")

Since I want to check many different objects in separate functions I would like to be able to keep the check method in place.

In general, how do I ensure that a function affects the passed object and does not create a copy?

myobj.size=5
resize(myobj,10)
print myobj.size  #jython =python2.5 => print is not a function

I can’t make resize a member method since the myobj implementation is out of reach, and I don’t want to type myobj=resize(myobj, 10) everywhere

Also, how can I make it so that I can access those attributes in a function to which i pass the object and the attribute name?

Answer 1

getattr isn’t a method, you need to call it like this

getattr(obj, prop)

similarly setattr is called like this

setattr(obj, prop, value)