Michele Simionato:
> No, slots have nothing to do with speed, they are a memory optimization.
In many languages, often in Python too, the less memory you use/
allocate the faster you go.
In fact slots allow a speed increase too (in new style classes):
from timeit import default_timer as clock
class C1(object):
__slots__ = ["a", "b"]
def __init__(self, a, b):
self.a = a
self.a = b
class C2(object):
def __init__(self, a, b):
self.a = a
self.a = b
def main(N, test):
t0 = clock()
if test == 1:
[C1(ab, ab) for ab in xrange(N)]
elif test == 2:
[C2(ab, ab) for ab in xrange(N)]
t1 = clock()
print round(t1 - t0, 2)
main(N=700*1000, test=1)
Core duo 2 GHz:
test=1 ==> 1.06 s
test=2 ==> 3.0 s
(700*1000 is the way I have found to write the 700_000 I was talking
about, until we'll have a syntax for it.)
Bye,
bearophile
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