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

[Bruce S. <Bru...@nc...>]

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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