adding methods at runtime and lambda

[Gabriel Genellina]

En Thu, 03 May 2007 16:52:55 -0300, Mike <msurel at comcast.net> escribió:

> I was messing around with adding methods to a class instance at
> runtime and saw the usual code one finds online for this. All the
> examples I saw say, of course, to make sure that for your method that
> you have 'self' as the first parameter. I got to thinking and thought
> "I have a lot of arbitrary methods in several utility files that I
> might like to add to things. How would I do that?" And this is what I
> came up with:

I don't see the reason to do that. If you have a function that does not  
use its "self" argument, what do you get from making it an instance method?
If -for whatever strange reason- you want it to actually be a method, use  
a static method:

py> def foo(x):
...   print "I like %r" % x
...
py> class A(object): pass
...
py> a = A()
py> A.foo = staticmethod(foo)
py> a.foo()
Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
TypeError: foo() takes exactly 1 argument (0 given)
py> a.foo("coffee")
I like 'coffee'
py> A.foo("tea")
I like 'tea'

-- 
Gabriel Genellina