Reversing a string
Diez B. Roggisch
deets at nospam.web.de
Wed Jun 27 13:08:18 EDT 2007
Scott wrote:
> Yeah I know strings == immutable, but question 1 in section 7.14 of "How
> to think like a computer Scientist" has me trying to reverse one.
>
> I've come up with two things, one works almost like it should except that
> every traversal thru the string I've gotten it to repeat the "list" again.
> This is what it looks like:
>
> [code]
>>>>mylist = []
>>>>def rev(x):
> for char in x:
> mylist.append(char)
> mylist.reverse()
> print mylist
> [/code]
<snip/>
The reverse() is totally useless to apply each when appending each
character. Not only useless, but faulty: if you have a even number of
characters, your string won't be reversed.
All you need to do is this:
>>> x = "abcdefg"
>>> print "".join(reversed(x))
gfedcba
HTH Diez
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