On Oct 12, 1:30 pm, [EMAIL PROTECTED] wrote: > Jill> How do I define a 2d list?
> > If you are looking to do numeric work with such multidimensional lists you > should consider the builtin array object or the numpy package: > > http://docs.python.org/dev/library/array.html#module-array The built-in array module does *NOT* support multidimensional arrays. The referenced docs say (first two sentences) "This module defines an object type which can compactly represent an array of basic values: characters, integers, floating point numbers. Arrays are sequence types and behave very much like lists, except that the type of objects stored in them is constrained." "behave very much like lists" is in no way to be construed as supporting multiple dimensions, and that type constraint means that you can't even have an array of arrays. However you can have a list of arrays; this can be a memory-efficient solution for some 2D applications. Note that arrays are not recommended for CPU efficiency, as (in general) each time you access an array element, a new Python object must be created. Escape clause: CPython and single-byte arrays (type 'c' and some values of types 'b' and 'B'). Cheers, John -- http://mail.python.org/mailman/listinfo/python-list
