Hello,
I am very sorry, All was already in the doc!
def _element_constructor_from_element_class(self, *args,
**keywords):
"""
...
Caveat: ``self`` is passed to the constructor of the
element class as a keyword argument ``parent``. Many
element classes in Sage, in particular those implemented
by mean of extension types, take ``parent`` as first
mandatory argument instead.
This incompatibility will be fixed soon (Fall 2009?) by
having all element classes take ``parent`` as first
mandatory argument, and updating this default
implementation of :meth:`_element_constructor_`.
...
"""
So I could have find myself the answer.
Cheers,
Nicolas.
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