Nicola Larosa wrote:
> # use new-style classes, if there's no cogent reason to do otherwise
> class A(object):
> def __init__(self, n):
> self.data = n
> def f(self, x = None)
> # do NOT use "if not x" !
> if x is None:
> print self.data
> else:
> print x
>
Using None might be problematic if None could be a valid argument. The
safest way all round is to use a unique object created just for this
purpose:
_marker = object()
class A(object):
def __init__(self, n):
self.data = n
def f(self, x=_marker)
if x is _marker:
x = self.data
print x
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