geoff@tux ~ $ python
Python 2.6.5 (release26-maint, Oct  7 2010, 09:29:21)
[GCC 4.4.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import array
>>> mytuple = [1,2,3,4]
>>> len(mytuple)
4
>>> mytuple.append('five')
>>> len(mytuple)
5