Replace Whole Object Through Object Method

[Bruno Desthuilliers]

digitalorganics at gmail.com wrote:
> Maric Michaud wrote:
> 
(snip)

>>This doesn't work in most cases (with new style classes), better recreat a
>>type which inherit from Class and Mixin, or Class.__dict__ with
>>Mixin.__dict__.
> 
> 
> What doesn't work exactly? The whole purpose of the mixin is to add
> functionality to the class and hence to all its instances on the fly.

very naïve solution:

def mixin(obj):

  def someFunc(self, ...)
    # code here
  def someOtherFunc(self, ...)
    # code here

  cls = obj.__class__
  cls.someFunc = someFunc
  cls.someOtherFunc = someOtherFunc

Just a bit less nïave solution:

def mixin(func):
  func._mixin = True
  return func

def mixable(func):
  return getattr(attr, '_mixin', False):

class Mixin(object):
  @mixin
  def someFunc(self, ...):
    # code here

  @mixin
  def someOtherFunc(self, ...)
    # code here


def mix(cls, mixincls):
  for name in dir(mixincls):
    attr = getattr(mixincls, name)
    if callable(attr) and mixable(attr):
       setattr(cls, name, attr)


Of course, one can do much better...


-- 
bruno desthuilliers
python -c "print '@'.join(['.'.join([w[::-1] for w in p.split('.')]) for
p in 'onurb at xiludom.gro'.split('@')])"