[Python-Dev] Some new additions to functools (original) (raw)

Paul Hankin paul.hankin at pobox.com
Sun Apr 15 22:11:23 CEST 2007

On 4/15/07, SevenInchBread <adamadamadamamiadam at gmail.com> wrote:

So I've cooked up some very simple functions to add to functools - to expand it into a more general-purpose module.

def cat(x): return x class nullfunc(object): def call(self, *args, **kargs): return self def getattr(self, name): return getattr(None, name) def multimap(func, seq, n=2): assert n > 0, "n must be positive" if n == 1: return map(func, seq) else: return map(lambda x: multimap(func, x, n-1), seq) def multifilter(func, seq, n=2): return multimap(lambda x: filter(func, x), seq, n-1) def multireduce(func, seq, n=2): return multimap(lambda x: reduce(func, x), seq, n-1)

-0 for cat (renamed to 'identity'), -1 for the rest.

I've occasionally wanted multimap but only in the default case where it is simpler to be explicit.

-- Paul Hankin

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