En Sat, 19 Sep 2009 22:59:21 -0300, Peng Yu <pengyu...@gmail.com> escribió:
I know that strings or numbers are immutable when they passed as
arguments to functions. But there are cases that I may want to change
them in a function and propagate the effects outside the function. I
could wrap them in a class, which I feel a little bit tedious. I am
wondering what is the common practice for this problem.
In addition to all previous responses: Sometimes, you have a function that
should return more than one piece of information. On other languages, you
have to choose *one* of them as *the* function return value, and the
others become out parameters. In Python you simply return all of them:
def decode_index(index):
"convert linear index into row, col coordinates"
return index // width, index % width # divmod would be better...
row, col = decode_index(index)
(Tecnically, you're still returning ONE object - a tuple. But since
packing and unpacking of values is done automatically, you may consider it
as returning multiple values at the same time).
--
Gabriel Genellina
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