Palindrome in Python

palindrome.py

import string
import unicodedata

def reverse_string(str):
    # reverses the phrase
    return ''.join(reversed(str))

def clean(str):
  # helps ignoring punctuation as we check palindrom phrases 
  translator=str.maketrans('','',string.punctuation)
  return str.translate(translator)

def normalize(str):
  # removes accents (if present) to compare 
    text = unicodedata.normalize('NFD', str)
    text = text.encode('ascii', 'ignore')
    text = text.decode("utf-8")
    return text

quit = ""
while(quit.lower() != "q"):
    print("Enter the phrase:")
    frase = input()
    reverso = reverse_string(clean(frase.strip())).replace(" ", "").lower()
    reverso = normalize(reverso)
    original = clean(frase.strip()).replace(" ", "").lower()
    original = normalize(original)
    if (original == reverso):
        print("The phrase is a palindrome")
    else:
       print("The phrase is NOT a palindrome")
    print("Press Q to quit or any other to continue")
    quit = input()