Peng Yu a écrit :
Hi
I'm still kind of confused about the terminology on classes in python.
Could you please let me know what the equivalent terms for the
following C++ terms?
C++ and Python having very different semantics and object models,
there's not necessarily a straight one to one mapping.
constructor
Python uses a smalltalk-like 2 phases instanciation / initialisation
scheme. First the "proper" construction (__new__) is called with the
class object as first argument, and it must return an unintialised
instance of the class. Then the initialiser (__init__) is called on this
instance.
Now one usually only implements the initialiser, as the default
object.__new__ method does what you would expect, so you'll often see
people qualifying __init__ as the constructor.
destructor
Python has no real destructor. You can implement a __del__ method that
will _eventually_ be called before the instance gets garbage-collected,
but you'd rather not rely on it. Also, implementing this method will
prevent cycle detection.
member function
=> method.
Note that Python's "methods" are really thin wrappers around function
objects that are attributes of the class object. You'll find more on
this here:
http://wiki.python.org/moin/FromFunctionToMethod
member variable
=> Attribute
virtual member function
All Python's methods are virtual.
function
=> function !-)
Note that in Python, functions and classes are objects.
I think that C++ "function" is equivalent to python "function" and C++
"member function" is equivalent to python "method". But I couldn't
locate where the original definitions of the corresponding python
terms in the manual as these term appear many times. Could you please
point me where to look for the definition of these python
corresponding terms?
You just cannot directly translate C++ into Python, and while there are
similarities trying to write C++ in Python will not get you very far.
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