On Saturday, August 31, 2013 9:42:55 AM UTC+2, Fabrice Pombet wrote:
> On Saturday, August 31, 2013 9:03:58 AM UTC+2, Gary Herron wrote:
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> > On 08/30/2013 11:07 PM, Fabrice Pombet
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> > wrote:
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> > ... long discussion elided ...
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> > well, look at that:
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> > a=(1,2)
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> > a=2+3 ->a is an object and I have changed its type and value from outside.
> > As far as I am concerned this is one hell of an encapsulation violation...
> > Could you do this -strictly speaking- in Java or C++?
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> > Yes, in fact you can do that in C++ and java:
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> > Obj1 a = ...some object...;
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> > { // new scope...
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> > Obj2 a = ...another object...;
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> > }
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> > On one line, the name 'a' is bound to one object, and later it is
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> > bound to another object. Your Python code is similar, binding the
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> > name 'a' to object (1,2) on one line and the object 5 on the next
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> > line. Granted, Python seems a little freer because, with it's
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> > dynamic typing, one doesn't need to create a new scope to rebind a
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> > name, but all languages with variable names allow some control over
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> > binding/rebinding names.
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> > But this has *nothing* at all to do with objects and encapsulation.
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> > Please don't confuse:
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> > the binding of names to objects and
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> > the existence of objects and their encapsulated behavior
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> > They are very different things.
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> > --
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> > Dr. Gary Herron
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> > Department of Computer Science
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> > DigiPen Institute of Technology
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> > (425) 895-4418
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>
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> That's interesting, can you do this in C++ or java:
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> class X():
def __init__(self, *arg):
for x in arg:
self.x=x
and then:
a=X("x","y","z")
and then:
a.w="w"
?
I guess my point was dynamic typing and encapsulation go a little in opposite
directions in terms of philosophy, and it is therefore clear that Python
privileges "dynamic typing" kind of thinking over encapsulation as a
philosophical stance. Am I the only one thinking like this?
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