On Wed, May 2, 2012 at 12:08 AM, P Purkayastha <[email protected]> wrote:
> Currently, in my Sage (python) code, I used lazy_attribute to achieve this.
> I tested the computation using cython and without lazy attribute and it
> speeds up by a factor of about 3 compared to the python code. So, I am
> looking for something that can defer the computation so that instantiating
> the class is fast.
Like Simon mentioned, you can add getattr and setattr support:
from sage.misc.all import lazy_attribute
cdef class A:
cdef public object __dict__
def __init__(self):
self.__dict__ = {}
def __getattr__(self, attr):
try:
return self.__dict__[attr]
except KeyError:
raise AttributeError
def __setattr__(self, attr, value):
self.__dict__[attr] = value
@lazy_attribute
def a(self):
# moderate amount of computation gives the answer 42
return 42
--Mike
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