python 类型大小

返回单位：字节

sys.getsizeof()

import sys
>>> sys.getsizeof('')

>>> sys.getsizeof('')

>>> sys.getsizeof('')

>>> sys.getsizeof()

>>> sys.getsizeof()

>>> sys.getsizeof()

>>> sys.getsizeof()

>>> sys.getsizeof()

>>> sys.getsizeof()

可以看出字符串是比整形占用空间小的，且整形在一定范围内占用空间是一样的

对比

import timeit
import sys
def f():
    a, b, c = ,,
    return sys.getsizeof(a *  + b *  + c)

def g():
    a, b, c = ,,
    return sys.getsizeof(str(a) + str(b) + str(c))

def f2():
    a, b, c = ,,
    return a *  + b *  + c

def g2():
    a, b, c = ,,
    return str(a) + str(b) + str(c)

print min(timeit.repeat(f2))
print min(timeit.repeat(g2))
print f()
print g()

结果

0.296730041504
0.70504784584

可以看出f()无论是从速度还是从内存占用都完胜g()

字典

>>> a
{: 'a', : 'b'}
>>> sys.getsizeof(a)

>>> a[] = "askjdfjllllllllllllll"
>>> a[] = "askjdfjllllllllllllll"
>>> a
{: 'a', : 'b', : 'askjdfjllllllllllllll', : 'askjdfjllllllllllllll'}
>>> sys.getsizeof(a)

>>> sys.getsizeof(a[])

>>> for i in range():
...     a[i] = "fq08888888888" *
...
>>> len(a)

>>> sys.getsizeof(a)