Re: [Visualpython-users] Problems with exception handling in vpython on Linux

[Guenter S. <Gue...@ph...>]

Thank you for the prompt answers and I am glad it's my setup because 
that should be easy to fix.

There is no typo in the examples. All is cut and paste out of ipython 
sessions.

I should have mentioned I use 64bit Ubuntu.
I use boost 1.35 (libboost1.35-dev) and python 2.6.2

I use this script to build and install vpython

#!/bin/bash

SOFTWARE=visual-5.12_release
ARCHIVE=$SOFTWARE.tar.bz2
ARCHIVEDIR="$SOFTWARE"
BUILDDIR=$SOFTWARE-install
tar jxvf $ARCHIVE
mkdir -p $BUILDDIR
cd $BUILDDIR
aptitude -y install libboost1.35-dev
aptitude -y install libsigc++-2.0-dev libgtkmm-2.4-dev libgtkglext1-dev 
libgtkglext1 libgtkglextmm-x11-1.2-0 libgtkglextmm-x11-1.2-dev 
libglademm-2.4-1c2a libglademm-2.4-dev
../$ARCHIVEDIR/configure --prefix /usr
make

#as root
cd $BUILDDIR
make install
echo /usr/lib/python2.6/site-packages >> 
/usr/lib/python2.6/dist-packages/site-packages.pth

If necessary I will setup a clean system from scratch and install 
vpython there, but I'd rather fix it without going this route.

Guenter Schneider

Bruce Sherwood wrote:
> I too am running Ubuntu 9.04, Visual 5.12, and I cannot reproduce any of these 
> errors. I have no idea what could be wrong. What is the statement you used to 
> configure the make?
> 
> Moreover, your Example 1 is exceptionally strange, as it should not give an 
> error of any kind (nor does it give an error for me). Is it possible that 
> there's a typo in your reporting of Example 1?
> 
> Bruce Sherwood
> 
> Guenter Schneider wrote:
>> I ran into a number of problems with vpython on Linux which appear to be 
>> all related. The problems do not happen in Windows. My system is ubuntu 
>> 9.04, vpython 5.12 compiled from source (5.11 gives identical results).
>>
>> Thee common feature I see on Linux is, whenever vpython raises an 
>> exception, python seg. faults.
>>
>> Example 1:
>>
>> In [1]: from visual import *
>>
>> In [2]: a = vector(1,2,3)
>>
>> In [3]: for i in a:
>>     ...:     print i
>>     ...:
>>     ...:
>> 1.0
>> 2.0
>> 3.0
>> Segmentation fault
>> ~ $
>>
>> but the following works:
>>
>> Example 2:
>>
>> In [1]: from visual import *
>>
>> In [2]: a = vector(1,2,3)
>>
>> In [3]: for i in a:
>>     ...:     print i
>>     ...:     if i>2:
>>     ...:         break
>>     ...:
>>     ...:
>> 1.0
>> 2.0
>> 3.0
>>
>> This seems to point to the raising a StopIteration exception as the 
>> problem point.
>>
>> Example 3:
>> In [1]: from visual import *
>>
>> In [2]: a = [1,2,3]
>>
>> In [3]: mag2(a)
>> Out[3]: 14.0
>>
>> In [4]: a = [1,2,'x']
>>
>> In [5]: mag2(a)
>> Segmentation fault
>> ~ $
>>
>> It should have raised a TypeError as in this case
>>
>> In [1]: from visual import *
>>
>> In [2]: a = [1,2,'x']
>>
>> In [3]: print a[0]*a[0]+a[1]*a[1]+a[2]*a[2]
>> ------> print(a[0]*a[0]+a[1]*a[1]+a[2]*a[2])
>> ---------------------------------------------------------------------------
>> TypeError                                 Traceback (most recent call last)
>>
>> Finally this fails as well:
>>
>> Example 5:
>> In [1]: from visual import *
>>
>> In [2]: quit()
>> Do you really want to exit ([y]/n)?
>> Segmentation fault
>> ~ $
>>
>> This error  is probably caused by a SystemExit exception.
>>
>> Is something wrong with my install? Hard to see how to go wrong there, 
>> it's configure, make, make install and taking care of site-packages in 
>> ubuntu 9.04.
>>
>> Thank you for your help and the great work.
>>
>> Guenter Schneider
>>
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