2004年08月10日 星期二 14:27
Python不需要自己分配内存,这就不需要有计算对象大小的说法啦! -----邮件原件----- 发件人: python-chinese-bounces at lists.python.cn [mailto:python-chinese-bounces at lists.python.cn] 代表 hoxide 发送时间: 2004年8月10日 12:59 收件人: gentoo.cn at 126.com, python-chines 主题: Re: Re: [python-chinese] 如何测量一个变量或者常量在内存中的大小 gentoo.cn,您好! 资料不错,他的讨论证实了python中很难准确计算对象占用的内存数. 其实现在我也对python的内存管理感兴趣,昨天发现mod_python好像存在内存 泄漏的问题. ======= 2004-08-10 12:53:49 您在来信中写道:======= >找到一个相关的讨论 >http://www.egenix.com/mailman-archives/egenix-users/2002-November/00015 >6.html > >gentoo.cn wrote: > >>我的意思是:是不是可以通过计算一个Object的Struct来猜测这个Object的大小? >>比如c='a', string="abcd" >>那么c的类型是1c, string的类型是4c >>calcsize('c')=1 >>calcsize('L')=4 >>也就是说一个数值型的对象占用4Bytes内存空间,一个字符型对象占用1Bytes内存 >>空间? >>对于string="abcd"这个对象,类型是4c所以占用4Bytes内存空间? >>不知道Python如何考虑对齐的(也许他最小的单位是1Bytes所以都是8bit的倍数, >>这样就对齐了?) >> >>大家都来讨论讨论啊。 >> >> >> >>limodou wrote: >> >> >> >>>gentoo.cn,您好! >>> >>> 那个不是内存的大小吧。而是对应的struct的大小。因为在python中都是对 象,而不仅仅是数据结构。不知道:你想知道内存大小有什么用? >>> >>>======= 2004-08-10 11:05:42 您在来信中写道:======= >>> >>> >>> >>> >>> >>>>import struct >>>>struct.pack >>>>struct.calcsize ? >>>> >>>>难道使用这个方法吗? >>>>我也想知道有什么方法来计算对象的size >>>> >>>>*calcsize*( fmt) >>>> >>>> Return the size of the struct (and hence of the string) >>>> corresponding to the given format. >>>> >>>>Format characters have the following meaning; the conversion between >>>>C and Python values should be obvious given their types: >>>> >>>>*Format* *C Type* *Python* *Notes* >>>>x pad byte no value >>>>c char string of length 1 >>>>b signed char integer >>>>B unsigned char integer >>>>h short integer >>>>H unsigned short integer >>>>i int integer >>>>I unsigned int long >>>>l long integer >>>>L unsigned long long >>>>q long long long (1) >>>>Q unsigned long long long (1) >>>>f float float >>>>d double float >>>>s char[] string >>>>p char[] string >>>>P void * integer >>>> >>>> >>>>tocer wrote: >>>> >>>> >>>> >>>> >>>> >>>>>比如: >>>>>a=[1,2,3] >>>>>测试 a 在内存中的所占的字节数 >>>>> >>>>>------------------------------------------------------------------- >>>>>----- >>>>> >>>>>_______________________________________________ >>>>>python-chinese list >>>>>python-chinese at lists.python.cn >>>>>http://python.cn/mailman/listinfo/python-chinese >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>>_______________________________________________ >>>>python-chinese list >>>>python-chinese at lists.python.cn >>>>http://python.cn/mailman/listinfo/python-chinese >>>> >>>> >>>> >>>> >>>> >>>= = = = = = = = = = = = = = = = = = = = >>> >>> >>> 致 >>>礼! >>> >>> >>> limodou >>> chatme at 263.net >>> 2004-08-10 >>> >>> >>> >>>--------------------------------------------------------------------- >>>--- >>> >>>_______________________________________________ >>>python-chinese list >>>python-chinese at lists.python.cn >>>http://python.cn/mailman/listinfo/python-chinese >>> >>> >>> >>> >> >>_______________________________________________ >>python-chinese list >>python-chinese at lists.python.cn >>http://python.cn/mailman/listinfo/python-chinese >> >> >> >> > >_______________________________________________ >python-chinese list >python-chinese at lists.python.cn >http://python.cn/mailman/listinfo/python-chinese = = = = = = = = = = = = = = = = = = = = 致 礼! hoxide hoxide_dirac at yahoo.com.cn 2004-08-10
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