How do you programmatically set an attribute?

by 
setattr(x, attr, 'magic')

For help on it:

>>> help(setattr)
Help on built-in function setattr in module __builtin__:

setattr(...)
    setattr(object, name, value)
    
    Set a named attribute on an object; setattr(x, 'y', v) is equivalent to
    ``x.y = v''.

However, you should note that you can’t do that to a “pure” instance of object. But it is likely you have a simple subclass of object where it will work fine. I would strongly urge the O.P. to never make instances of object like that.

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