Python Error

[Jürgen A. Erhard]

On Sun, Jul 29, 2012 at 01:08:57PM +0200, Peter Otten wrote:
> subhabangalore at gmail.com wrote:
> 
> > Dear Group,
> > 
> > I was trying to convert the list to a set, with the following code:
> > 
> > set1=set(list1)
> > 
> > the code was running fine, but all on a sudden started to give the
> > following error,
> > 
> > set1=set(list1)
> > TypeError: unhashable type: 'list'
> > 
> 
> Add a print statement before the offending line:
> 
> print list1
> set1 = set(list1)
> 
> You will see that list1 contains another list, e. g. this works...
> 

Peter's right, but instead of a print before the line, put a
try/except around it, like

   try:
      set1 = set(list1)
   except TypeError:
      print list1
      raise

This way, only the *actual* error triggers any output.  With a general
print before, you can get a lot of unnecessary output.

Grits, J