"Shi Mu" wrote:
>I use Python 2.3 to run the following code:
>>>> a=[[1,2],[4,8],[0,3]]
>>>> a.sort()
>>>> a
> [[0, 3], [1, 2], [4, 8]]
>>>>
> I wonder whether the sort function automatically consider the first
> element in the list of list as the sorting criteria or it just happens
> to be?
the documentation has the answer:
http://docs.python.org/ref/comparisons.html
"Tuples and lists are compared lexicographically using comparison of
corresponding elements. This means that to compare equal, each
element must compare equal and the two sequences must be of the
same type and have the same length.
If not equal, the sequences are ordered the same as their first differing
elements."
</F>
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