Path: csiph.com!eternal-september.org!feeder.eternal-september.org!mx02.eternal-september.org!.POSTED!not-for-mail
From: Paul Rubin <no.email@nospam.invalid>
Newsgroups: comp.lang.python
Subject: Re: The Cost of Dynamism (was Re: Pyhon 2.x or 3.x, which is faster?)
Date: Sun, 13 Mar 2016 16:25:43 -0700
Organization: A noiseless patient Spider
Lines: 24
Message-ID: <87wpp6c64o.fsf@jester.gateway.pace.com>
References: <mailman.8.1457732171.12893.python-list@python.org> <nbvqg5$3cm$1@dont-email.me> <mailman.23.1457749230.12893.python-list@python.org> <56e44258$0$1598$c3e8da3$5496439d@news.astraweb.com> <mailman.46.1457819135.12893.python-list@python.org> <8737rvxs89.fsf@elektro.pacujo.net> <nc2a7s$6dv$1@dont-email.me> <mailman.48.1457831488.12893.python-list@python.org> <nc4ffn$f6s$1@dont-email.me>
Mime-Version: 1.0
Content-Type: text/plain
Injection-Info: mx02.eternal-september.org; posting-host="6f8cc70e6892455e89d230a40ec2704b"; logging-data="6461"; mail-complaints-to="abuse@eternal-september.org";	posting-account="U2FsdGVkX1/s6JTks4H1ur1nnVdmWbyO"
User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux)
Cancel-Lock: sha1:sax+Izz5aLrb3aorcmSMBmfqYys= sha1:uNeCWhKE8wLwfrS/wTX14sM4gqc=
Xref: csiph.com comp.lang.python:104790

BartC <bc@freeuk.com> writes:
> def case(*args):
>     return any((arg == switch.value for arg in args))

def case(values): 
    return switch.value in values

> I used it in my benchmark to replace the if-else chain checking three
> lots of ranges:
>
> switch(c)
> if case(ord("A"),ord("B"),ord("C"),ord("D"),ord("E"),ord("F"),
>         ord("G"),ord("H"),ord("I"),ord("J"),ord("K"),ord("L"),
>         ord("M"),ord("N"),ord("O"),ord("P"),ord("Q"),ord("R"),
>         ord("S"),ord("T"),ord("U"),ord("V"),ord("W"),ord("X"),
>         ord("Y"),ord("Z")):
>     upper+=1

Use a set instead of a big tuple:

    uppers = { ord("A"), ord("B"), ... ord("Z") }
    ...
    if case(uppers):
       upper += 1