Lorenzo Di Gregorio wrote:
On 21 Jun., 01:54, Dave Angel <da...@ieee.org> wrote:
...
class B(object):
def __init__(self,test=None):
if test==None:
test = A()
self.obj =()
return
...
I had also thought of using "None" (or whatever else) as a marker but
I was curious to find out whether there are better ways to supply an
object with standard values as a default argument.
In this sense, I was looking for problems ;-)
Of course the observation that "def" is an instruction and no
declaration changes the situation: I would not have a new object being
constructed for every instantiation with no optional argument, because
__init__ gets executed on the instantiation but test=A() gets executed
on reading 'def'....
If what you are worrying about is having a single default object, you
could do something like this:
class B(object):
_default = None
def __init__(self, test=None):
if test is None:
test = self._default
if test is None:
B._default = test = A()
...
--Scott David Daniels
scott.dani...@acm.org
--
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