|
Thanks for the bug report. It
actually appears to be a bug in our method call logic, and is definitely and
interesting corner case. In this case we think make_prop is a
method on the class DataType and we think when you call it with cls.(…)
that we should add cls in as the first instance parameter (which is quite
wrong). Therefore your arguments are shifted over by one, and read_only
is a type (which when you check to see if it’s true throws
not-implemented for it’s length). One work around that’ll make this
work in both CPython and IronPython is to explicitly declare make_prop static: @staticmethod
def make_prop(cls, name, type, read_only=False):
prop_name = '_%s__%s' % (cls.__name__, name)
We should be able to get this one fixed
for beta 6. Do
you want to help develop Dynamic languages on CLR? (http://members.microsoft.com/careers/search/details.aspx?JobID=6D4754DE-11F0-45DF-8B78-DC1B43134038) From:
[EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Nathan R. Ernst With the following (contrived) metaclass sample, I get a
NotImplementedError on the indicated line. It appears to be due to
IPythonContainer interface members being unimplemented in
IronPython.Runtime.ReflectedType. I’ve attached the .Net stack
separately as it was a little ugly. #######Begin Code Block 1 ####### #!/usr/bin/env python class DataType(type):
def __init__(cls, name, bases, dct):
dct = dict([(k, cls.make_prop(cls, k, v)) for k, v in dct.iteritems()])
type.__init__(cls, name, bases, dct)
def make_prop(cls, name, type, read_only=False):
prop_name = '_%s__%s' % (cls.__name__, name)
def setter(self, __x):
setattr(self, prop_name, type(__x))
def getter(self):
return getattr(self, prop_name)
if
read_only:
## Error occurs here.
return property(getter)
else:
return property(getter, setter) class Test(object):
__metaclass__ = DataType
foo = str
bar = int t = Test() t.foo = 'Hello World' t.bar = 42 print '%s: %d' % (t.foo,
t.bar) #######End Code Block 1 ####### IronPython stack: File …\metatest.py, line 23, in Initialize File …\metatest.py, line 6, in __init__ File …\metatest.py, line 18, in make_prop NotImplementedError: The method or operation is not
implemented. CPython output: Hello World: 42
#######Begin Code Block 2 ####### #!/usr/bin/env python class DataType(type):
def __init__(cls, name, bases, dct):
dct = dict([(k, cls.make_prop(cls, k, v)) for k, v in dct.iteritems()])
type.__init__(cls, name, bases, dct)
def make_prop(cls, name, type, read_only=False):
prop_name = '_%s__%s' % (cls.__name__, name)
def setter(self, __x):
setattr(self, prop_name, type(__x))
def getter(self):
return getattr(self, prop_name)
return property(getter, setter) class Test(object):
__metaclass__ = DataType
foo = str
bar = int t = Test() t.foo = 'Hello World' t.bar = 42 print '%s: %d' % (t.foo,
t.bar) #######End Code Block 2####### Output: Hello World: 42 I’ve not yet had a chance to take a crack at a patch,
but I wanted to bring this up as soon as possible. Thanks, as always, for all your hard work, guys. -Nathan Ernst |
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