Pythonian string manipulation.

[Aahz Maruch]

In article <937if5$r9q$1 at nnrp1.deja.com>,  <johnvert at my-deja.com> wrote:
>
>I was playing around with slices in Python (is that the correct term?)
>and I tried, in order to switch the words `hello,' and `world', to do:
>
>s = 'hello, world'
>l = s.find(',')
>s[0:l] = s[l + 1:]
>
>which in theory would seem to work, but I get the error:
>
>Traceback (most recent call last):
>  File "<stdin>", line 1, in ?
>TypeError: object doesn't support slice assignment
>
>my two questions are: why isn't this allowed, and what is the Pythonian
>way of doing this?

Strings are immutable, so you can't assign to a slice.  Here's what I'd
do:

s = 'hello, world'
l = s.split(', ')
l.reverse()
s = string.join(l, ', ')

(I'm assuming you're using Python 2.0 because of the s.find())
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