On 5/12/2011 9:11 AM, JamesEM wrote:
I would prefer to generate the properties code dynamically from the
keys of the dictionaries.
What I am looking for is something like:
class MyClass(object):
def __init__(self):
self.d = {}
d['field1'] = 1.0
d['field2'] = 'A'
d['field3'] = [10.0,20.0,30.0]
for f in d:
create_property(f)
where create_property(f) dynamically creates the property code for
field f in MyClass.
Is this possible?
Without actually trying, I am not sure, but I believe maybe (possibly
version dependent). The init method is the wrong place. Create the
properties exactly once, just after the class is created. It is possible
to add functions to classes as attributes (instance methods) after they
are created. The property decorators *might* require that they be
invoked with the class body, I do not know. I would first try with
property().
Assuming dict name 'd' is fixed:
def gsd(key):
def get(self):
return self.d[key]
def set(self, value):
self.d[key] = value
def del(self):
del self.d[key]
return get,set,del
for key in fieldnames:
setattr(MyClass, key, property(*gsd(key)))
For recent versions, this could be done within a class decorator, but
that is only convenient syntactic sugar.
--
Terry Jan Reedy
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