Exercise on www.practicepython.org

palindrome.py

while True:
    something = input('Input text("exit" to break): ')

    if something == 'exit':
        break

    # exceptions
    restricted_symbols = [' ', '!', '.',
                          '?', ',', '_',
                          '$', '#', '@',
                          '"', "'", ':',
                          ';', '`', '*',
                          '(', ')', '%',
                          '-', '--', '---']
    new_something = [s for s in something if s not in restricted_symbols]
    new_something = ''.join(new_something).lower()

    if new_something == new_something[::-1]:
        print('Input text is palindrome.')
    else:
        print('Input text is not palindrome.')