Suppose I have a python object x and a string s, how do I set the attribute s on x? So:
>>> x = SomeObject() >>> attr = 'myAttr' >>> # magic goes here >>> x.myAttr 'magic' What's the magic? The goal of this, incidentally, is to cache calls to x.__getattr__().
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.
dirty attribute to user input...
__slots__ attribute.
int as well. Can you explain why? (is it on all __builtin__'s?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 setattr and getattr built-in functions. However, they don't work on instances of object directly.
>>> 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) 
Also works fine within a class:
def update_property(self, property, value): setattr(self, property, value) If you want a filename from an argument:
import sys filename = sys.argv[1] file = open(filename, 'r') contents = file.read() If you want an argument to show on your terminal (using print()):
import sys arg = sys.argv[1] arg1config = print(arg1config) 
