Solving problem is about exposing yourself to as many situations as possible like How do you programmatically set an attribute? and practice these strategies over and over. With time, it becomes second nature and a natural way you approach any problems in general. Big or small, always start with a plan, use other strategies mentioned here till you are confident and ready to code the solution.
In this post, my aim is to share an overview the topic about How do you programmatically set an attribute?, which can be followed any time. Take easy to follow this discuss.
Suppose I have a python object
x and a string
s, how do I set the attribute
'myAttr' # magic goes here x.myAttr 'magic'x = SomeObject() attr =
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 a 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
object() setattr( a, 'hi', 'mom' ) Traceback (most recent call last): File "<stdin>", line 1, in <module> AttributeError: 'object' object has no attribute 'hi'a=
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)
Also works fine within a class:
def update_property(self, property, value): setattr(self, property, value)