得到python对象的真实大小

sys.getsizeof只给你这个对象和他的属性的大小，并没有递归的寻找sub-attributes。

sys.getsizeof得到的大小总感觉奇怪…

下面是一个能到真实大小的脚本：

import sysdef get_size(obj, seen=None):    """Recursively finds size of objects"""    size = sys.getsizeof(obj)    if seen is None:        seen = set()    obj_id = id(obj)    if obj_id in seen:        return 0    # Important mark as seen *before* entering recursion to gracefully handle    # self-referential objects    seen.add(obj_id)    if isinstance(obj, dict):        size += sum([get_size(v, seen) for v in obj.values()])        size += sum([get_size(k, seen) for k in obj.keys()])    elif hasattr(obj, '__dict__'):        size += get_size(obj.__dict__, seen)    elif hasattr(obj, '__iter__') and not isinstance(obj, (str, bytes, bytearray)):        size += sum([get_size(i, seen) for i in obj])    return size

例：

class People(object):    def __init__(self, name, age, dender):        self.name = name        self.age = age        self.gender = gender        p1 = People('Li Li', 30, 'Female')p2 = People('Wang Wang', 25, 'Male')>>>sys.getsizeof(p1)>>>56>>>sys.getsizeof(p2)>>>56>>>get_size(p1)>>>465>>>get_size(p2)>>>467

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