Bugs item #1123716, was opened at 2005-02-16 01:48
Message generated for change (Comment added) made by mcherm
You can respond by visiting:
https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1123716&group_id=5470
Category: Documentation
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Steven Bethard (bediviere)
Assigned to: Nobody/Anonymous (nobody)
Summary: descrintro describes __new__ and __init__ behavior wrong
Initial Comment:
The current descrintro.html says:
"__new__ must return an object... If you return an
existing object, the constructor call will still call
its __init__ method. If you return an object of a
different class, its __init__ method will be called..."
This suggests that __new__ will call __init__ of the
object even if the object is a different type. The
code in typeobject.c disagrees with this:
static PyObject *
type_call(PyTypeObject *type, PyObject *args, PyObject
*kwds)
{
...
/* If the returned object is not an instance of type,
it won't be initialized. */
if (!PyType_IsSubtype(obj->ob_type, type))
return obj;
...
}
Suggested fix:
"__new__ must return an object... If you return an
existing object, the constructor call will still call
its __init__ method unless the object is an instance of
a different class..."
----------------------------------------------------------------------
>Comment By: Michael Chermside (mcherm)
Date: 2005-02-23 10:02
Message:
Logged In: YES
user_id=99874
I agree strongly that the docs need to be clarified.
I spent a while playing around with it and confirmed that
your reading of it appears to be correct, and your proposed
wording is simple and straightforward.
I second the request to make this change.
----------------------------------------------------------------------
You can respond by visiting:
https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1123716&group_id=5470
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