"[EMAIL PROTECTED]" <[EMAIL PROTECTED]> writes:
> Hi, I'm trying to write a for loop in place of the string
> method .replace() to replace a character within a string if it's
> found.
I think you mean you want to replace the last occurrence of the
character in the string, but leave other occurrences intact.
> So far, I've got
>
> s = raw_input("please enter a string: ")
> c = raw_input("please enter a character: ")
So far so good
> b_s = s[::-1] #string backwards
> found = False #character's existence within the string
I wouldn't bother with this
> for i in range(0,len(s)):
I'd use the built-in rindex function to find the last index:
loc = s.rindex(c)
Note this will raise an exception if c isn't found. If you don't
want that, use rfind instead of rindex. rfind will return -1 and
then you'll have to check for that.
> print "the last occurrence of %s is in position: " % (c),
> print (len(s)-i)-1 #extract 1 for correct index
You can put both expressions in the same formatted string:
print "the last occurrence of %s is in position %d: " % (c, loc)
> s2 = s.replace(c,"!")
> print "the new string with the character substituted is: " + s2
s2 = '%s!%s'% (s[:loc], s[loc+1:])
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