is python Object oriented??
bruno.42.desthuilliers at websiteburo.invalid
Mon Feb 2 04:59:59 EST 2009
Michael Torrie a écrit :
> Steve Holden wrote:
>> You can think what you like, but there is a fundamental difference
>> between methods of a class and functions of a module. Until you
>> appreciate that you will likely make mistakes. Don't worry, though, we
>> all learn from our mistakes.
> And this fundamental difference is?
That a method is bound to a class and (usually) an instance of this class.
> From what I can tell an instance method is an object that encapsulates
> the function object in a closure
> that makes sure it has a reference to
the method object is instanciated by the function object itself when it
is looked up upon a class or instance (thanks to the descriptor
protocol). It (the method object) stores the function, the class and (if
bound) the instance as attributes, and it's __call__ method takes care
of calling the function with the instance as first positional argument.
> I know that you dynamically add functions to objects creating
> methods dynamically, by using new.instancemethod or something.
Or simply by manually invoking the descriptor protocol:
print "self is", self
f = Foo()
f.func = func.__get__(f, type(f))
> This seems to indicate to me that there are functions and there are
> functions. Methods are in fact functions, just with a callable wrapper
> around them.
Methods *are* the callable wrapper around functions - so they can't be
functions themselves. From this POV, the functions wrapped by methods
are actually the *implementation* of the method.
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