Can you make this faster?

[alejandro david weil]

On Sun June 27 2004 21:18, Christopher T King wrote:

> If neither of the above apply to you, or give you the speedup you need,
> try using the Psyco JIT compiler to compile the function. After installing
> Psyco, all you need to do is to 'import psyco' and 'psyco.bind(fmtstring)'
> at the top of the file your function resides in.

I had never tried psyco, so I did it:

Some more stats (arguments given: [ 'hola','que','tal',324,454,False] )

			no psyco	| psyco
original code	4.664s	| 2.132s
modified ver	2.222s	| 0.840s

print 4.66 / 0.84
 -> 5.54..

Not yet 7x faster :-( but 5.5 is very good i think.

modified version:
slen = []
for i in xrange(256):
    slen.append(str(i)+'s'
typedic = {
    types.IntType: 'i',
    types.LongType: 'q',
    types.BooleanType: 'c',
    types.FloatType:'d'}

def myfmtstring(args):
    global typedic, slen
    flen = slen
    ftypedic = typedic
    f2 = '<'
    st = types.StringType
    for arg in args:
        t = type(arg)
        if t == st:
            l = len(arg)
            if l<256:
                f2+=flen[l]
            else:
                f2+=str(l)+'s'
        else:
            try:
                f2+=ftypedic[t]
            except:
                raise Exception("Can't pack argument of type %s!" % t)
    return f2+'\0'

Saludos,
alejandro
-- 
+ There is no dark side of the moon really. Matter of fact it's all dark.