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# Author: Dr. Jan Pearce
# username: pearcej

# Purpose: To demo some string functions
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# Acknowledgements:
# remove punctuation function
#         from http://www.ict.ru.ac.za/Resources/cspw/thinkcspy3/thinkcspy3_latest/strings.html
# palindromes from http://www.buzzfeed.com/fjelstud/the-21-best-palindromes
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import sys

def testit(did_pass):
    """ Print the result of a test. """
    # This function works correctly--it is verbatim from the text
    linenum = sys._getframe(1).f_lineno # Get the caller's line number.
    if did_pass:
        msg = "Test at line {0} ok.".format(linenum)
    else:
        msg = ("Test at line {0} FAILED.".format(linenum))
    print(msg)

def remove_punctuation(s):
    '''returns a string with all punctuation removed from input'''
# modified from http://www.ict.ru.ac.za/Resources/cspw/thinkcspy3/thinkcspy3_latest/strings.html
    punctuation = "!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~ " # space added
    s_sans_punct = ""
    for letter in s:
        if letter not in punctuation:
            s_sans_punct += letter
    return s_sans_punct

def is_palindrome(str):
    '''takes a string input, converts to lowercase, removes punctuation, and
    returns true if the string is a palindrome'''
    lowerinput=str.lower()
    nopunctinput=remove_punctuation(lowerinput)
    #print(nopunctinput) # for testing purposes
    return nopunctinput == nopunctinput[::-1]

#Some tests
testit(is_palindrome("This is a palendome--NOT!")==False)
testit(is_palindrome("Nurses RUN!!!")==True)
testit(is_palindrome("Mr. Owl ate my metal worm...")==True)
testit(is_palindrome("Ogre, flog a golfer. GO!")==True)
testit(is_palindrome("Was it a car or a cat I saw?")==True)
testit(is_palindrome('A dog! A panic in a pagoda!')==True)

builder=['Mom', 'Dad']
buildit="'{0}, {1}, note: I dissent! A fast never prevents a fatness. I diet on {1}, {0}!!'".format(builder[0],builder[1])
#buildit=raw_input('Enter possible paldindrome for testing:\n')

if is_palindrome(buildit):
    print(buildit+' is a palindrome.')
else:
    print(buildit+' is not a palindrome.')