Re: [Jython-users] __main__ in embedded jython

[Ype K. <yk...@xs...>]

Matt,

>Hi all,
>
>I have an application which embeds jython, and whenever I run a script,
>the __name__ variable is set to  '__builtin__' by I assume the
>interpreter.
>Normally in python, modules can check the value of __name__ to selectively
>run code based on being run from the commandline (value of '__main__') vs
>being imported.
>Whats the best way to do this in jython?
>Currently what I do is shown below but I'm not sure if this is correct.
>The reason for my apprehension is that when I just run an interactive
>interpreter, I notice that sys.modules has a __main__ module, so I'm
>wondering if I have to create that or something else special.

PyUnit uses the __name__ variable to obtain the namespace of the
module it is being called from. So you'll need to add a module
with named __name__ if you want to support this. You might want
to save an evt. previous module with the same name.

In Jython (off the top of my head):

mainName = '__main__'
if sys.modules.has_key(mainName):
    oldMod = sys.modules[mainName]
else:
    oldMod = None

try:
    mod = new.module(mainName)
    sys.modules[mainName] = mod
    mod.__dict__['__name__'] = mainName
    execfile('myscript.py', mod.__dict__)
finally:
    if oldMod is not None:
        sys.modules[mainName] = oldMod
    else:
        del sys.modules[mainName]
    mod = None

>Any help appreciated, thanks,

I've never done this in java, so you'll have to translate yourself
and/or do it all in jython and execfile that. Import the larger part
as a function or class for efficiency.
You might also want to control sys.path, use a search path for your
scripts, and catch exceptions from execfile().

Have fun,
Ype

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