Strange (?) list comprehension behavior

[Peter Hansen]

Peter Hansen wrote:
> 
> George Henry wrote:
[a question]
> 
> Please post the precise traceback, cut and pasted.  If it really said
> that, and your subsequent analysis is valid, I think one of your "ops"
> is not a string...

Cancel that... I didn't see your subsequent followup before I posted,
because it was not linked to the previous thread.  You already found
the problem... :-)

-Peter