On Feb 10, 8:06 am, "[EMAIL PROTECTED]" <[EMAIL PROTECTED]>
wrote:
> 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.
>
> So far, I've got
>
> s = raw_input("please enter a string: ")
> c = raw_input("please enter a character: ")
> b_s = s[::-1] #string backwards
>
> found = False #character's existence within the string
>
> for i in range(0,len(s)):
> if(b_s[i] == c):
> print "the last occurrence of %s is in position: " % (c),
> print (len(s)-i)-1 #extract 1 for correct index
> found = True
> break #run just once to print the last position
> if found:
> s2 = s.replace(c,"!")
> print "the new string with the character substituted is: " +
> s2
>
> I need to replace s2 = s.replace(c,"!") with a for loop function
> somehow.
>
> I don't really see how a for loop would iterate through the string and
> replace the character, and would like to see an example if possible.
Do the character checking and replacement in the same loop.
s = raw_input("please enter a string: ")
c = raw_input("please enter a character: ")
new_string = ''
replacement_character = '!'
found = False
for each_char in s[::-1]:
if found:
new_string += each_char
elif not found and each_char == c:
new_string += replacement_character
found = True
else:
new_string += each_char
print 'New string is : %s' % new_string[::-1]
PS: String addition is not the most efficient thing in the world.
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