I'm interested in gathering some statistics on this, and to do so I need
a way of measuring the list's logical size versus its actual size. The
first is easy: it's just len(list). Is there some way of getting the
allocated size of the list?
With Python 2.6 and newer you can use sys.getsizeof() to get the actual
size of the list object:
import sys, struct
sys.getsizeof([])
72
a = [1,2,3]
b = []
b.append(1)
b.append(2)
b.append(3)
sys.getsizeof(a)
96
sys.getsizeof(b)
104
def slots(lst):
... return (sys.getsizeof(lst) - sys.getsizeof([])) /
struct.calcsize("P")
...
slots(b)
4
slots(a)
3
Christian
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