计算python中对象的内存大小

一般的sys.getsizeof()显示不了复杂的字典。

查看类中的内容：

def dump(obj):
 for attr in dir(obj):#dir显示类的所有方法
   print("  obj.%s = %r" % (attr, getattr(obj, attr)))

这里用递归调用所有对象的getsizeof：

def get_size(obj, seen=None):
   # From https://goshippo.com/blog/measure-real-size-any-python-object/
   # 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