Hi Chris, On Apr 27, 6:43 pm, Chris Rebert <c...@rebertia.com> wrote: > On Tue, Apr 27, 2010 at 4:36 PM, GZ <zyzhu2...@gmail.com> wrote: > > I want to store a reference to a function into a class property. > > > So I am expecting that: > > > class A: > > fn = lambda x: x > > > fn = A.fn > > fn(1) > > > Traceback (most recent call last): > > File "<string>", line 1, in <string> > > TypeError: unbound method <lambda>() must be called with A instance as > > first argument (got int instance instead) > > > The problem is that A.fn is treated as a bounded method. I really want > > A.fn to be a variable that stores a reference to a function. Is there > > any way to achieve this? > > Use the staticmethod() decorator: > > class A(object): > @staticmethod > def fn(x): > return x > > #rest same as before > > Cheers, > Chris > --http://blog.rebertia.com- Hide quoted text - > > - Show quoted text -
I do not think it will help me. I am not trying to define a function fn() in the class, but rather I want to make it a "function reference" so that I can initialize it any way I like later. For example, I want to be able to write the following: A.fn = lambda x : x*x f = A.fn f(1) A.fn = lambda x : x^2 f= A.fn f(2) In other words, I want to make A.fn a reference to a function not known to me at the time I define class A. I want to be able to initialize it later. -- http://mail.python.org/mailman/listinfo/python-list
