Question

random.choice(seq)
Return a random element from the non-empty sequence seq. If seq is empty, raises IndexError.


what is a sequence in this case? it might be a list or string ?

Answer 1

Yes, Lists and strings are both sequences. There are a few other sequences in Python as well: http://docs.python.org/2.6/library/stdtypes.html#sequence-types-str-unicode-list-tuple-buffer-xrange .