Python3基本类型在64位上的占用内存情况

基本类型占用的内存

• 类型



• # -*- coding: utf-8 -*-
  # @time : 2019-12-19 11:16
  # @author : binger
  import sys
  a = none
  b = 1000.2311
  c = 1000
  d = true
  e = ""
  f = ()
  g = []
  h = set([])
  i = {}
  print(" %s size is %d " % (type(a), sys.getsizeof(a)))
  print(" %s size is %d " % (type(b), sys.getsizeof(b)))
  print(" %s size is %d " % (type(c), sys.getsizeof(c)))
  print(" %s size is %d " % (type(d), sys.getsizeof(d)))
  print(" %s size is %d " % (type(e), sys.getsizeof(e)), sys.getsizeof("12"))
  print(" %s size is %d " % (type(f), sys.getsizeof(f)), sys.getsizeof((1,)))
  print(" %s size is %d " % (type(g), sys.getsizeof(g)), sys.getsizeof([1, ]))
  print(" %s size is %d " % (type(h), sys.getsizeof(h)), sys.getsizeof(set([1, ])))
  print(" %s size is %d " % (type(i), sys.getsizeof(i)), sys.getsizeof({1: 1}))
  

• 结果：
  内存大小排行： none
  

• size is 16 byte
  size is 24 byte
  size is 28 byte
  size is 28 byte
  size is 49 byte 51
  size is 56 byte 64
  size is 72 byte 80
  size is 232 byte 232
  size is 248 byte 248

   

  
  

分析：

• int和float:
  
  
  
  • int和float的64位系统中的 python 3 内存消耗：int > float
  
  
  • 间接费用（pyobject_head）增加了一倍，但整数的大小从32位变为64位，而浮点数（双精度）的大小仍为64：
  
  

  • 32位
    int：开销= 10字节，值= 4字节
    float：开销= 8字节，value = 8字节
    64位
    int：开销= 20字节，值= 8字节
    float：开销= 16个字节，值= 8个字节
    

  
  
  
  

• 
  
  
  
  • 在64位 python 2 中 int 和 float 均为 24b。但是 int 不包含 long类型（28b）
  
  
  
  

• 字典与链表

from bintrees import bintree
import uuid, time, sys
import random
def create_uuid(msg):
src_uuid = uuid.uuid4()
name = "{}{}".format(time.time(), msg)
return uuid.uuid3(src_uuid, name=name).hex
a = {create_uuid(i): random.randint(0, 10) for i in range(2000)}
b = {i: i for i in range(2000)}
ring = bintree.binarytree()
c = [ring.insert(create_uuid(i), i) for i in range(2000)]
ring2 = bintree.binarytree()
d = [ring2.insert(i, i) for i in range(2000)]
print("字典1", sys.getsizeof(a))
print("字典2", sys.getsizeof(b))
print("二叉树：", sys.getsizeof(c))
print("二叉树：", sys.getsizeof(d))

• 
  
  
  
  • 结果：
  
  
  
  

字典1 73832
字典2 73832
二叉树： 16568
二叉树： 16568