2004年08月10日 星期二 14:02
需求不同导致需要解决的问题不同,如果都用回C了,那就没有Python了呀:) 有的时候确实直接看源码来得更快些 Jerry Marx wrote: >"Zoom.Quiet"> > 我的看法是,我用Python就是为了不关心这些破事.要不然我还是用回C好了.什么都能控制. >用Python不就是为了方便么?干么么了解那么底层. > > 如果对Python的语言实现有兴趣可以直接研究Python的源代码啊.在QQ群里面也有人在研究 >吧,忘记是谁了. > >======= 2004-08-10 13:21:40 您在来信中写道:======= > > > >>Hollo hoxide: >> >> 嗯嗯! >>感觉Python 从一开始就是关注 创造力的实现 ,而不是运行效率! >>所以,丰富的数据类型后面,可能就是松散的内容管理, >> >>但是不影响Python 的快速布属和应用是也乎,毕竟现在的内存真的不值钱了!Windows 已经开始要求独占200Mb 内存了! >> >>当然这得是有浑厚 C 基础的同志们来关注,提升Python 的内涵是也乎?? >> >>其实,可以利用C,写一个内存探针,嵌入到Python 脚本中运行来测试各种对象运行时的内存使用情况是也乎??? >> >> >>/******** [2004-08-10]13:17:47 ; hoxide wrote: >> >>hoxide> gentoo.cn,您好! >> >>hoxide> 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. >>hoxide> 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. >> >>hoxide> ======= 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/000156.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 >>>> >>>> >>hoxide> = = = = = = = = = = = = = = = = = = = = >> >> >>hoxide> 致 >>hoxide> 礼! >> >> >>hoxide> hoxide >>hoxide> hoxide_dirac at yahoo.com.cn >>hoxide> 2004-08-10 >> >> >> >>********************************************/ >> >>-- >>Free as in Freedom >> >>Zoom.Quiet >> >>#=========================================# >>]Time is unimportant, only life important![ >>#=========================================# >> >>sender is the Bat!2.12.00 >> >>_______________________________________________ >>python-chinese list >>python-chinese at lists.python.cn >>http://python.cn/mailman/listinfo/python-chinese >> >> >> > >= = = = = = = = = = = = = = = = = = = = > > > 致 >礼! > > > Jerry Marx > zhiyuan.ma at enorbus.com.cn > 2004-08-10 > > > >------------------------------------------------------------------------ > >_______________________________________________ >python-chinese list >python-chinese at lists.python.cn >http://python.cn/mailman/listinfo/python-chinese > >
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