IIRC it's an old micro-optimization; this was a common idiom at Zope. But I think it's way overused -- people believe it works so they do it all the time, even for code that's not performance sensitive, just because it's become a habit. (Like "register" in C in the '80s.)

On Tue, Oct 27, 2015 at 10:55 AM, Yury Selivanov <yselivanov.ml@gmail.com> wrote:

Serhiy,

On 2015-10-27 1:45 PM, Serhiy Storchaka wrote:

There is known trick to optimize a function:

    def foo(x, y=0, len=len, pack=struct.pack, maxsize=1<<BPF):
        ...