Suppose I have a python object
x and a string
s, how do I set the attribute
>>> x = SomeObject() >>> attr = 'myAttr' >>> # magic goes here >>> x.myAttr 'magic'
What’s the magic? The goal of this, incidentally, is to cache calls to
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''.
Edit: However, you should note (as pointed out in comment) 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.
Usually, we define classes for this.
class XClass( object ): def __init__( self ): self.myAttr= None x= XClass() x.myAttr= 'magic' x.myAttr
However, you can, to an extent, do this with the
getattr built-in functions. However, they don’t work on instances of
>>> a= object() >>> setattr( a, 'hi', 'mom' ) Traceback (most recent call last): File "<stdin>", line 1, in <module> AttributeError: 'object' object has no attribute 'hi'
They do, however, work on all kinds of simple classes.
class YClass( object ): pass y= YClass() setattr( y, 'myAttr', 'magic' ) y.myAttr
let x be an object then you can do it two ways
x.attr_name = s setattr(x, 'attr_name', s)