[Ironpython-users] Gradually executing a python script

[Jesper Taxbøl]

The reason I want to do it gradually is that I cant be sure that the script
ever terminates or has syntax errors. Would that not be a problem in a turn
based setup?


2012/7/23 Keith Rome <rome at wintellect.com>

>  You may want to look into leveraging the sys.settrace() feature of
> Python for controlling line-by-line execution. This API allows you to
> install a profiling function that gets invoked for every frame of script
> code that is executed. In your profiling function, you could compute the
> amount of memory being used by variables within the ScriptScope, and halt
> execution if you need to. Just be careful about what you do in your
> profiling function, as it will be called extremely often by the runtime.**
> **
>
> ** **
>
> http://docs.python.org/library/sys.html#sys.settrace****
>
> ** **
>
> ** **
>
> The reason you are seeing variant results is probably due to how you have
> implemented multithreading. The IronPython runtime is mostly thread-safe
> (as long as you don’t use libraries that make use of mutable objects, and
> as long as you import all libraries used at least once prior to forking
> threads). But your code must also be thread-safe as well. From your
> descriptions of your game engine, it sounds like your game engine is not
> designed to be thread-safe so I would strongly recommend avoiding
> multithreading as a means of providing resource sharing. It is very
> difficult to write 100% thread-safe code, and nothing will stop people from
> writing unsafe scripts in your game.****
>
> ** **
>
> Instead, I would suggest implementing your game engine as a turn-based
> system. For each turn, the script for each character is executed
> completely. This will allow you to cycle through all characters one turn at
> a time, equally, and will also eliminate the problem of having variant
> outcomes since the program will become deterministic.****
>
> ** **
>
> ** **
>
> ** **
>
> *Keith Rome*
>
> *Senior Consultant and Architect*
>
> MCPD-EAD, MCSD, MCDBA, MCTS-WPF, MCTS-TFS, MCTS-WSS****
>
> Wintellect | 770.617.4016 | krome at wintellect.com <rome at wintellect.com>****
>
> www.wintellect.com****
>
> ** **
>
> *From:* ironpython-users-bounces+rome=wintellect.com at python.org [mailto:
> ironpython-users-bounces+rome=wintellect.com at python.org] *On Behalf Of *Jesper
> Taxbøl
> *Sent:* Monday, July 23, 2012 11:05 AM
> *To:* Kevin Hazzard
> *Cc:* ironpython-users at python.org
> *Subject:* Re: [Ironpython-users] Gradually executing a python script****
>
> ** **
>
> Would that allow me to step gradually through a loop?****
>
> ** **
>
> like:****
>
> ** **
>
> x = 0****
>
> while x < 10:****
>
>    dostuff()****
>
>    x=x+1****
>
> while x > 0:****
>
>    dootherstuff()****
>
>    x=x-1****
>
> ** **
>
> ** **
>
> ** **
>
> 2012/7/23 Kevin Hazzard <wkhazzard at gmail.com>****
>
> Why don't you use a scripting host and inject commands into a ScriptEngine
> reusing a ScriptScope as you need to execute them?****
>
>  ****
>
> Kevin****
>
> On Mon, Jul 23, 2012 at 5:31 AM, Jesper Taxbøl <jesper at taxboel.dk> wrote:*
> ***
>
>  Hi,****
>
> ** **
>
> I am not that familiar with Ironpython yet, but I have a question that I
> hope you can help me answer.****
>
> ** **
>
> I am working on a programming-game where I will allow users to do some
> simple python scripting against a simple API that I will control a game
> character. Instructions like move and shoot etc, alongside some simple
> sense functions that return info on the game world. ****
>
> ** **
>
> My current prototype creates an ironpython engine for each game character
> and executes the script in a thread by itself, which sort of works. But I
> have the problem that the outcome of executing the game gives different
> results every time. Therefore I would like to ask the question:****
>
> ** **
>
> Is it possible to execute a script inside the Ironpython engine gradually?
> ****
>
> ** **
>
> I imagine that I could update a list of engines with a tick(int cycles)
> and get a fair sharing of resources between engines and ensure the same
> result every time.****
>
> ** **
>
> Kind regards ****
>
> ** **
>
> Tax****
>
> ** **
>
> ** **
>
> P.S:****
>
> As this is a programming game I would also like to be able to limit the
> available memory each script is using. Is there a way to limit this, so a
> script like this would be killed.****
>
> ** **
>
> x = 0****
>
> v = {}****
>
> while True:****
>
>    v[x]=x****
>
>    x= x + 1****
>
> ** **
>
> ** **
>
> ** **
>
> _______________________________________________
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>
>
>
>
> --
> *W. Kevin Hazzard*****
>
> Consultant, Author, Teacher, Microsoft MVP****
>
> (804) 928-3444****
>
> book <http://manning.com/hazzard> | mvp<https://mvp.support.microsoft.com/profile/Kevin.Hazzard>|
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> ****
>
> ** **
>
> ** **
>
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