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from oopp import isplaindata,inspect
class TracedAccess(type):
"Metaclass converting data attributes to properties"
def __init__(cls,name,bases,dic):
cls.datadic={}
for a in dic:
if isplaindata(a):
cls.datadic[a]=dic[a]
def get(self,a=a):
v=cls.datadic[a]
print "Accessing %s, value=%s" % (a,v)
return v
def set(self,v,a=a):
print "Setting %s, value=%s" % (a,v)
cls.datadic[a]=v
setattr(cls,a,property(get,set))
class C(object):
__metaclass__ = TracedAccess
a1='x'
class D(C): # shows that the approach works well with inheritance
a2='y'
i=D()
i.a1 # => Accessing a1, value=x
i.a2 # => Accessing a2, value=y
i.a1='z' # => Setting a1, value=z
i.a1 # => Accessing a1, value=z
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