At Tuesday 7/11/2006 21:47, Jia Lu wrote:
> In Python, the real constructor is called __new__, >
> Carl Banks
But the code below won't invoke __new__:
Is this a question, or just for making things more and more confusing
to beginners?
class Test:
def __new__(self, value):
print "__new__",value
For old-style classes __new__ is not used. On new-style classes it's
used mostly for dealing with immutable objects. The code should be:
class NewStyle(object):
"A new style class inherits from object in some way"
def __new__(cls, value):
print "NewStyle.__new__",value
return super(NewStyle, cls).__new__(cls, value)
# return object.__new__(cls, value) for lazy people
def __init__(self, value):
print "NewStyle.__init__",value
class OldStyle:
"An old style class does not inherit from object"
def __init__(self, value):
print "OldStyle.__init__",value
n = NewStyle(1)
o = OldStyle(2)
--
Gabriel Genellina
Softlab SRL
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