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Re: Storing a big amount of path names

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On Fri, Feb 12, 2016 at 3:15 PM, Paulo da Silva
<p_s_d_a_s_i_l_v_a_ns@netcabo.pt> wrote:
> Às 03:49 de 12-02-2016, Chris Angelico escreveu:
>> On Fri, Feb 12, 2016 at 2:13 PM, MRAB <python@mrabarnett.plus.com> wrote:
>>> Apart from all of the other answers that have been given:
>>>
> ...
>>
>> Simpler to let the language do that for you:
>>
>>>>> import sys
>>>>> p1 = sys.intern('foo/bar')
>>>>> p2 = sys.intern('foo/bar')
>>>>> id(p1), id(p2)
>> (139621017266528, 139621017266528)
>>
>
> I didn't know about id or sys.intern :-)
> I need to look at them ...
>
> As I can understand I can do in MyFile class
>
> self.dirname=sys.intern(dirname) # dirname passed as arg to the __init__
>
> and the character string doesn't get repeated.
> Is this correct?

Correct. Two equal strings, passed to sys.intern(), will come back as
identical strings, which means they use the same memory. You can have
a million references to the same string and it takes up no additional
memory.

But I reiterate: Don't even bother with this unless you know your
program is running short of memory. Start by coding things in the
simple and obvious way, and then fix problems only when you see them.

ChrisA

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Thread

Storing a big amount of path names Paulo da Silva <p_s_d_a_s_i_l_v_a_ns@netcabo.pt> - 2016-02-12 00:31 +0000
  Re: Storing a big amount of path names Chris Angelico <rosuav@gmail.com> - 2016-02-12 11:39 +1100
  Re: Storing a big amount of path names Ben Finney <ben+python@benfinney.id.au> - 2016-02-12 11:44 +1100
  Re: Storing a big amount of path names Tim Chase <python.list@tim.thechases.com> - 2016-02-11 19:13 -0600
    Re: Storing a big amount of path names Rob Gaddi <rgaddi@highlandtechnology.invalid> - 2016-02-12 02:17 +0000
  Re: Storing a big amount of path names MRAB <python@mrabarnett.plus.com> - 2016-02-12 03:13 +0000
  Re: Storing a big amount of path names Chris Angelico <rosuav@gmail.com> - 2016-02-12 14:49 +1100
    Re: Storing a big amount of path names Paulo da Silva <p_s_d_a_s_i_l_v_a_ns@netcabo.pt> - 2016-02-12 04:15 +0000
      Re: Storing a big amount of path names Chris Angelico <rosuav@gmail.com> - 2016-02-12 15:23 +1100
        Re: Storing a big amount of path names Paulo da Silva <p_s_d_a_s_i_l_v_a_ns@netcabo.pt> - 2016-02-12 04:45 +0000
          Re: Storing a big amount of path names Chris Angelico <rosuav@gmail.com> - 2016-02-12 16:02 +1100
            Re: Storing a big amount of path names Paulo da Silva <p_s_d_a_s_i_l_v_a_ns@netcabo.pt> - 2016-02-12 05:49 +0000
            Re: Storing a big amount of path names Steven D'Aprano <steve@pearwood.info> - 2016-02-12 16:51 +1100
        Re: Storing a big amount of path names Rob Gaddi <rgaddi@highlandtechnology.invalid> - 2016-02-12 17:05 +0000
          Re: Storing a big amount of path names Chris Angelico <rosuav@gmail.com> - 2016-02-13 04:18 +1100
          Re: Storing a big amount of path names Mark Lawrence <breamoreboy@yahoo.co.uk> - 2016-02-12 21:37 +0000
          Re: Storing a big amount of path names Ben Finney <ben+python@benfinney.id.au> - 2016-02-13 08:49 +1100
          Re: Storing a big amount of path names Matt Wheeler <funkyhat@gmail.com> - 2016-02-12 23:31 +0000
            Re: Storing a big amount of path names mkondrashin@gmail.com - 2016-02-13 12:19 -0800
  Re: Storing a big amount of path names srinivas devaki <mr.eightnoteight@gmail.com> - 2016-02-12 11:46 +0530

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