得到python对象的真实大小

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 objectsseen.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 = nameself.age = ageself.gender = genderp1 = 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

相关介绍：

1. https://goshippo.com/blog/measure-real-size-any-python-object/
2. https://github.com/bosswissam/pysize/blob/master/pysize.py