[reportlab-users] Re: Font Naming Problems

[Robin Becker]

Timothy Smith wrote:
> i have a situation where i'm using a list of lists for a data in a 
> table, then deleteing some elements from it and reusing it, and i'm 
> getting this error. i'm double triple checked all the rows in it are the 
> same lenght, so i'm a bit stumped as to what this error means.
> 
> File 
> "/usr/local/lib/python2.3/site-packages/reportlab/platypus/tables.py", 
> line 419, in _hasVariWidthElements
>    value = self._cellvalues[row][col]
> IndexError: list index out of range
> 
..... you're probably hitting a mutable re-use problem. The lists are not copied 
into the table internally. Deleting a row/column in one usage will affect all so 
unless you are careful the error is fairly easily created.

For example

 >>> A=[[1,2,3],[4,5,6]]
 >>> B = A
 >>> del B[0][-1], B[1][-1]
 >>> A
[[1, 2], [4, 5]]
 >>>
-- 
Robin Becker