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

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

I'll summarize what I learned about installing vpython on ubuntu in  a 
new thread.

As for why I believe that exceptions are common to all the examples  I 
presented, a python loop

1 for item in sequence:
2     body

is internally equivalent to

1 iter = sequence.__iter__()
2 try:
3     while True:
4         item = iter.next()
5         body
6 except StopIteration:
7     pass

Guenter

Bruce Sherwood wrote:
> I don't understand enough about building on Linux to be sure that it would help, 
> but it might be worth building according to the instructions in INSTALL.txt, 
> since that's how I've built Visual and it works. Moreover, the configure stage 
> will tell you if you're missing certain dependencies. On the other hand, it 
> seems possible that there's some incompatibility between Visual and 64bit Ubuntu 
> (I only have access to 32bit Ubuntu).
> 
> You suspect that "whenever vpython raises an exception, python seg. faults", but 
> in your Example 1 there's no reason why VPython would raise an exception.
> 
> Bruce Sherwood
> 
> Guenter Schneider wrote:
>> 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
>>
> 
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