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# cooperative_init.py
"""Given a hierarchy, makes __init__ cooperative.
The only change needed is to add a line
__metaclass__ = CooperativeInit
to the base class of your hierarchy."""
from decorators import decorator
class CooperativeInit(type):
def __init__(cls, name, bases, dic):
@decorator
def make_cooperative(__init__, self, *args, **kw):
super(cls, self).__init__(*args, **kw)
__init__(self, *args, **kw)
__init__ = dic.get("__init__")
if __init__:
cls.__init__ = make_cooperative(__init__)
class Base:
__metaclass__ = CooperativeInit
def __init__(self):
print "B.__init__"
class C1(Base):
def __init__(self):
print "C1.__init__"
class C2(Base):
def __init__(self):
print "C2.__init__"
class D(C1, C2):
def __init__(self):
print "D.__init__"
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