On 3 Sep, 20:03, John Nagle <na...@animats.com> wrote: > Python doesn't have immutable objects as a general concept, but > it may be headed in that direction. There was some fooling around > with an "immmutability API" associated with NumPy back in 2007, but > that was removed. As more immutable types are added, a more general > approach may be useful.
I one did a test of NumPy's mutable arrays against Matlab's immutable arrays on D4 wavelet transforms. On an array of 64 MB of double precision floats, the Python/NumPy version was faster by an order of magnitude. On the other hand, immutable arrays does make multithreading easier. They are particularly interesting for GPGPUs (OpenCL/CUDA) where multithreading is pervasive. Also they allow removal of temporary arrays, which are created by NumPy's binary operators. -- http://mail.python.org/mailman/listinfo/python-list
