[Numpy-discussion] not inheriting from ndarray

[Neal Becker]

Neal Becker wrote:

> I wanted the function of an array that accumulates my results, it starts
> at
> zero size, and resizes as needed.  New results are added using
> 
> accumulated += new_array
> 
> A simple implementation of this is here:
> 
> https://gist.github.com/2ab48e25fd460990d045.git
> 
> I have 2 questions:
> 
> 1. Is this a reasonable approach?
> 
> 2. I overloaded += to do 1) resize 2) call ndarray += operator
> Is there some way to just overload all arithmetic operators similarly all
> at
> the same time?  (I don't need them for the current work, I'm just
> curious).

Well one thing, due to (what IMO is) a bug in pickle,
https://bugs.python.org/issue5370

you need to modify, this seems to work:

    def __getattr__(self, name):        # delegate all operations not 
specifically overridden to base array
        if 'arr' in self.__dict__:      # this is to allow unpickle avoid 
infinite recursion
            return getattr (self.arr, name)
        raise AttributeError(name)