[Numpy-discussion] not inheriting from ndarray

[Neal Becker]

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).

[Neal Becker]

Post by Neal Becker
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
https://gist.github.com/2ab48e25fd460990d045.git
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)