Checking whether two strings are a palindrome - ignoring and using case writing?

Question

What follows is a simple script. Basically, I'm experimenting with strings, and I want to check whether a string is a palindrome (ignoring lower upper case), and if it is reverse it with the same writing of the original string (upper- and lowercase):

input = "Repaper"
reverse = reversed(input)

if input == reverse:
    print(reverse)

I don't get any error warning - it's just no input?

Answer 1

First off, using input as a variable is bad practice as it's already a built-in function (see: https://docs.python.org/3/library/functions.html). Sure, it doesn't hurt your code, but it also doesn't benefit you in any way! Why not call the string e.g. input_string or in_str?

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As far as I understood you, you want to compare two strings - ignoring lower- and uppercase writing:

in_str = 'Anna'

#Ignoring lower-/uppercase
in_str = in_str.casefold()

#Reversing the string
rev_str = reversed(in_str)

Now it's important to know that the built-in function reversed(), which we've been using for now, returns a reverse iterator, so we shall (one example) compare via list():

#Comparing the string and check whether it's a palindrome
if list(in_str) == list(rev_str):
    #Outputting the reversed string; for example via slicing
    print(in_str[::-1])

-> So for the example input Anna, the output would be annA which should be exactly what you wanted.