Re: Python Strinh Immutability Broken!

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  • Hendrik van Rooyen

    Re: Python Strinh Immutability Broken!


    "Gabriel Genellina":
    >To avoid altering the equilibrium of the whole universe, use
    >ctypes.create_ string_buffer:
    >http://python.net/crew/theller/ctype...tal-data-types
    Thanks Gabriel – looks like I really have to spend more time with that
    excellent document.


    Patrick Maupin:
    >Whenever I do low-level stuff like this, I'm in one of two modes:
    >
    >Mode #1: I'm using somebody else's C library and the overhead of
    >doing so is small.
    >
    >Mode #2: I need to code my own low-level stuff (for speed, IO access,
    >whatever).
    This seems to be where I am at.
    >
    >In mode 1, I try not to break out a compiler. ctypes is great for
    >this, and the results are "pure python" to the extent that you can
    >give pure python to someone else with the same C library, and it will
    >work. No muss, no fuss, no makefile, no question that ctypes is
    >awesome stuff.
    >
    >In mode 2, I have to break out a compiler. I almost never do this
    >without ALSO breaking out Pyrex. Pyrex is also awesome stuff, and in
    >Pyrex, you can easily create a (new) Python string for your results
    >without having to worry about reference counting or any other really
    >nasty low level interpreter details. You can code a lot of stuff in
    >pure Pyrex, and you can easily mix and match Pyrex and C.
    >
    >Pyrex and ctypes are both tools which let me connect to non-Python
    >code without having to remember to handle Python interpreter internals
    >correctly. If I can get by with ctypes, I do, but if I actually have
    >to code in something other than Python to get the job done, I bypass
    >ctypes and go straight for Pyrex.
    Don’t know anything about Pyrex except that it is not in the
    standard library on Suse – will try to read up on it. Thanks.

    Terry Reedy:
    >Which essentially is the bytearray type of 3.0.
    How does it differ from plain old array.array(b,” The quick brown fox”)?

    - Hendrik


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