[Python-ideas] Function composition (was no subject)

[Steven D'Aprano]

On Sun, May 10, 2015 at 03:51:38AM +0300, Koos Zevenhoven wrote:

> Another way to deal with elementwise operations on iterables would be to 
> make a small, mostly backwards compatible change in map:
> 
> When map is called with just one argument, for instance map(square), it 
> would return a function that takes iterables and maps them element-wise.
> 
> Now it would be easier to use map in pipelines, for example:
> 
> rms = sqrt @ mean @ map(square)

Or just use a tiny helper function:

def vectorise(func):
    return partial(map, func)

rms = sqrt @ mean @ vectorise(square)


-- 
Steve