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pythonpython-3.xstringreverse

Printing a String in Reverse After Extracting

I am trying to create a program in which the user inputs a statement containing two '!' surrounding a string. (example: hello all! this is a test! bye.) I am to grab the string within the two exclamation points, and print it in reverse letter by letter. I have been able to find the start and endpoints that contain the statement, however I am having difficulties creating an index that would cycle through my variable userstring in reverse and print.

test = input('Enter a string with two "!" surrounding portion of the string:')
expoint = test.find('!')
     #print (expoint)
twoexpoint = test.find('!', expoint+1)
     #print (twoexpoint)
userstring = test[expoint+1 : twoexpoint]
     #print(userstring)


number = 0
while number < len(userstring) :
    letter = [twoexpoint - 1]
    print (letter)
    number += 1
Solution

  • twoexpoint - 1 is the last index of the string you need relative to the input string. So what you need is to start from that index and reduce. In your while loop:

    letter = test[twoexpoint- number - 1]

    Each iteration you increase number which will reduce the index and reverse the string.

    But this way you don't actually use the userstring you already found (except for the length...). Instead of caring for indexes, just reverse the userstring:

    for letter in userstring[::-1]:
    print(letter)