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Re: Comprehension with two variables - explanation needed

References (2 earlier) <002501d00733$6995dce0$3cc196a0$@gmail.com> <mailman.16191.1416757555.18130.python-list@python.org> <roy-B11F64.10563923112014@news.panix.com> <07f25264-1286-4d98-820c-949dba711248@googlegroups.com> <5472b74d$0$12979$c3e8da3$5496439d@news.astraweb.com>
Date 2014-11-24 15:51 +1100
Subject Re: Comprehension with two variables - explanation needed
From Chris Angelico <rosuav@gmail.com>
Newsgroups comp.lang.python
Message-ID <mailman.16222.1416804702.18130.python-list@python.org> (permalink)

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On Mon, Nov 24, 2014 at 3:42 PM, Steven D'Aprano <steve@pearwood.info> wrote:
> Today dis() returns the above, tomorrow it may return:
>
>               0 LOAD_GLOBAL              0 (x)
>               3 INCREMENT
>               5 RETURN_VALUE
>
> (say), and the Python code remains the same even though the byte code is
> different.

I hope not! The x in the original function was a local, not a global,
and if dis.dis() says LOAD_GLOBAL for something that's not global, it
would be *very* confusing! :)

But yes, CPython could grow an INCREMENT bytecode, and it'd not break anything.

ChrisA

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Thread

Comprehension with two variables - explanation needed "Ivan Evstegneev" <webmailgroups@gmail.com> - 2014-11-23 16:56 +0200
  Re: Comprehension with two variables - explanation needed Rustom Mody <rustompmody@gmail.com> - 2014-11-23 07:09 -0800
    RE: Comprehension with two variables - explanation needed "Ivan Evstegneev" <webmailgroups@gmail.com> - 2014-11-23 17:37 +0200
    Re: Comprehension with two variables - explanation needed Chris Angelico <rosuav@gmail.com> - 2014-11-24 02:42 +1100
    RE: Comprehension with two variables - explanation needed Skip Montanaro <skip.montanaro@gmail.com> - 2014-11-23 09:45 -0600
      Re: Comprehension with two variables - explanation needed Roy Smith <roy@panix.com> - 2014-11-23 10:57 -0500
        Re: Comprehension with two variables - explanation needed Rustom Mody <rustompmody@gmail.com> - 2014-11-23 08:45 -0800
          Re: Comprehension with two variables - explanation needed Rustom Mody <rustompmody@gmail.com> - 2014-11-23 09:17 -0800
          RE: Comprehension with two variables - explanation needed "Ivan Evstegneev" <webmailgroups@gmail.com> - 2014-11-23 19:27 +0200
          Re: Comprehension with two variables - explanation needed Steven D'Aprano <steve@pearwood.info> - 2014-11-24 04:42 +0000
            Re: Comprehension with two variables - explanation needed Chris Angelico <rosuav@gmail.com> - 2014-11-24 15:51 +1100
              Re: Comprehension with two variables - explanation needed Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-11-25 09:20 +1100
            Re: Comprehension with two variables - explanation needed Rustom Mody <rustompmody@gmail.com> - 2014-11-23 22:47 -0800
            Re: Comprehension with two variables - explanation needed Dan Stromberg <drsalists@gmail.com> - 2014-11-24 16:42 -0800
        Re: Comprehension with two variables - explanation needed Skip Montanaro <skip.montanaro@gmail.com> - 2014-11-23 10:45 -0600
        Re: Comprehension with two variables - explanation needed Roy Smith <roy@panix.com> - 2014-11-23 12:08 -0500
        Re: Comprehension with two variables - explanation needed Jon Ribbens <jon+usenet@unequivocal.co.uk> - 2014-11-23 17:46 +0000

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