On Tue, 19 Jun 2007 18:54:41 +1000, Ben Finney wrote:
> "Ethan Kennerly" <[EMAIL PROTECTED]> writes:
>
>> I really like properties for readonly attributes,
>
> Python doesn't have "readonly attributes", and to attempt to use
> properties for that purpose will only lead to confusion.
class Parrot(object):
def _plumage(self):
return "Beautiful red plumage"
plumage = property(_plumage)
>>> parrot = Parrot()
>>> parrot.plumage
'Beautiful red plumage'
>>> parrot.plumage = "Ragged grey feathers"
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AttributeError: can't set attribute
It walks like a read-only attribute, it squawks like a read-only
attribute, but since Python doesn't have read-only attributes, Ben must be
right: using properties to implement read-only attributes will only lead
to confusion.
*wink*
--
Steven.
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