[Numpy-discussion] subclassing ndaray

Travis Oliphant oliphant at ee.byu.edu
Mon Feb 27 11:26:04 CST 2006

Stefan van der Walt wrote:

>>The __init__ and __new__ methods are not called because they may have 
>>arbitrary signatures.  Instead,  the __array_finalize__ method is always 
>>called.  So, you should use that instead of __init__.
This is now true in SVN.  Previously, __array_finalize__ was not called 
if the "parent" was NULL.  However, now, it is still called with None as 
the value of the first argument.

Thus __array_finalize__ will be called whenever ndarray.__new__(<some 
subclass>,...) is called.


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