Re: [Jython-dev] jythonc breaks "import random"

[<bc...@wo...>]

[Chris Monson]

>My program works fine in jython, but I can't use jythonc to create an 
>applet.
>
>I narrowed the problem down to this line of python code:
>
>    import random
>
>The stack trace given when I try to run the applet is as follows (it's 
>longer than that, but I'm trying to keep the message short).
>
> Java Traceback:
>
>        at org.python.core.__builtin__.eval(__builtin__.java)
>...
>        at random$_PyInner._verify$1(random.java:377)
>
>    <snip>
>
>So, it appears that the _verify method in the random module is doing an 
>eval!

Indeed. Rather thoughless bit of code there. I suggest you edit your
copy of random.py to have an empty _verify() function:

def _verify(name, expected):
    pass

I have posted a patch to CPython and will include a version of random.py
in 2.1b1 that does not use eval().

>That's all well and good, but I don't have org.python.core.parser 
>anywhere in my jar file.  Oops.
>
>It turns out that adding that file doesn't help.  If I use the --all 
>flag, I get this:
>Java Traceback:
>
>java.security.AccessControlException: access denied 

Using --all with applets is a topic for a different post.

>So, I tried not importing random at all, but rather doing a simple eval:
>
>print eval("1 + 1")
>
>Again, I am required to use --all (which kind of makes sense), and 
>again, I get an AccessControlException just like above.
>
>Does this mean that I can't use eval or any module that uses eval in my 
>applets?

Correct, you can't use eval() or compile() in a restricted environment
such as applets.

regards,
finn